Is it normal that i feel like this?

Hey
So my story is: A few years ago I was a very social person, enjoyed get out and go to every party ... I was relaxed, comfortable with others... I talked a lot with other people and know how to interact with them... I had confidence in myself and felt like I could be myself and do stupid things, and didn't give much attention to what others might think, because I felt that people liked me the way I was. I can even say, I was kind of popular. Knew many people and felt that people liked to talk to me, etc.

Lately I've been the opposite. I don't really know why. Now, I don't have confidence, I don't think I'm an interesting person, I don't feel that others want to talk to me or know me... I don't feel comfortable in large groups of friends. I don't have confidence to interact with others, don't know what to say, it's awkward.
Also, I no longer want to go to parties or going out (because I don't feel comfortable and it seems I don't have fun anymore). Instead, I prefer to stay at house, where I feel comfortable.
I still go out sometimes, though, to maintain contact with the nearest thing I have to "friends", at this time. But as I said, I enjoy more stay at home, in my "comfort zone".
Over time, I pulled myself from a lot of people that I was close. Now we still talk, but it seems that is not the same thing.
I think when people see/know me through facebook, they have another image of me. They think I'm very confident and social, because I always get many likes on my pics. But the truth is I feel alone most of the time.
Some people who know me (but know almost nothing about me), text me on facebook too, but I rarely feel disposition and willingness to talk to them. I spend most of the time on facebook offline in chat.

I am currently living with my boyfriend. He is a very closed person who does not like to be surrounded by many people, but if t's only for me or a few people, it's okay. I think maybe he, and other factors that happend on my life, have led me to be as I am today..
I started to date him when we were studying in high school. Before we start our relationship, he used to go home at all intervals and was always alone. He was very shy/closed with people.
So when I started to date him, spent all my time with him, because he didn't have a group of friends. He was a little more social after starting to date with me, because I brought him to my group of friends. Still, he didn't create a great approach with them and he would rather just be with me, so I was always with him in all classes breaks and went me away from other people.

I'm not blaming him for anything or want to. I know that probably it's my fault and only I can do something to change my social life. But I don't know what to do. Now we're on college. Before going I had planned take this opportunity to change my social life. But it continues all the same.. I want to change, but at the same time I'm contradicting myself because I have no desire to go out.
Some advice? Thank you very much for your time :)