Is it normal that i feel useless?

Keep in mind the source of your frustration: you hate yourself because you don't do anything. You don't have skills because you don't spend the effort to train them.

You will continue to be miserable if you don't change your lifestyle. It is easy and comfortable to be miserable, because you don't have to make any effort or sacrifices. It is painful but fulfilling to improve.

I'm the exact same way, except I'm 24 and a lesbian. I feel like I almost could have written this myself - amazing. I wish that I had advice to give you, but sorry, I don't. I just wanted to let you know you're not alone.

Okay thinking that shyness is bad is stupid.
I find shy girls really cute! :3 And I'm not alone.
The job thing, no one can get an easy "1st" job (you get what I mean). Its usually why CV s suck so much.

But don't worry about not liking yourself is normal. Everyone goes trough some shit some day. Find someone you trust, talk with them :) trust is nice.
Stay the shy way you are, just push on it a little.
-SCP-

Based on what I've read, I feel like you and me have a lot in common. I probably have anxiety just as bad as you. I remember when I dreaded going to the store just because I was that uncomfortable around people. I've struggled a lot because of how shy I am, but I also feel like I've come a long way from where I was. I've been to college, worked a few jobs, and I am making it on my own. I'm not special and if I'm doing it so can you. With that said, I haven't had much of a social life so far, so I still have a long ways to go.

What I'm getting at, I understand it's tough to do things when you're uncomfortable all the time, but when you put yourself in enough situations, you learn how to deal with it better because you will feel more secure. If you keep trying, you will find opportunities, but you need that initiative.

Yeah I feel you, I don't like going outside or talking to people at all. I like to sit in front of my computer and post on the internet.

Get help for your problem, and work towards overcoming your extreme shyness. Maybe you have social anxiety?

Also, I wanted to say that I do regret not being more outgoing and brave when I was younger, not taking my chances, because I know for a fact that I missed out on lots of possible friendships and relationships that I could have had, and as a result of all that right now I feel kind of socially isolated. People form "groups" and after a while it becomes hard or impossible to make new friends. And it's something I think about everyday, that I can't have the freedom to hang out with people when I want and just have fun, be myself, and be able to share great experiences end adventures with other people. I used to have friends but they all basically drifted apart from me. And it just makes things worse because I'm constantly thinking that new people will judge me when they find out that I have no social life. It is tough to deal with and there are no real answers. I wish I could tell you that things do always get better, but I don't even know if that's true. All I can do is keep an open mind and continue to believe that there are nice people out there.
And as a guy, let me just say that when you find someone special, he will like you for you - your personality, character, interests, and quirks. He will never want you to change yourself for him, but he will always respect any decision you take to improve yourself and value whatever direction you want to take your life. Good luck my friend!

There are people in this world who really love what they do and get paid to follow their dreams, then there are people who don't necessarily love their jobs but they realize it's something that has to be done if they want to support themselves or their families. Not everyone is lucky enough to belong to the first category, believe it or not. And either way there is nothing wrong with that.
At your age it's totally normal to not have any job experience. In fact, most people are graduating college at 22 with maybe only a few months of having done an internship, and are just getting ready to enter the jobs market for real.
Social anxiety is tied to confidence which is tied to self esteem and how you feel about yourself. It's all related. You say that you have no friends and that makes you feel worthless. And it's easy to think that no one is going to miss you when you're not around because you think no one cares about you. But there will always be people who will - whether or not you see them. We are all important and valuable, remember that.
I don't have much friends either, but my biggest fans are my parents and my younger brother, and everything I do and have done has been all for them. I am who I am today because they've always had my back. I'm not the most sociable person, but I enjoy being in crowds and soaking up the energy from being around others, even if (weirdly enough) one on one interaction still sometimes freaks me out. I am shy too, but instead of seeing it as a negative thing I make it a positive attribute. I'm proud of being shy, just like I'm proud of being smart, caring, passionate, and enthusiastic. I have my fair share of regrets too, things that I know I missed out on because I just wasn't bold enough, and missed opportunities in my life that could have brought me to a better place than I am today. That being said, I'm never going to stop trying to improve myself and make the most of my life. I'm not going to stop helping others and believing that good things happen when people work together and lift each other up.

You don't have to be good at anything specific to get a job. They will train you and you get good by practice.
If you don't like something about yourself then change it. Yeah it's hard but would you rather continue to be miserable or take a chance by stepping out of your comfort zone?