Is it normal to enjoy being alone?

Yes some people find comfort in solitude.

Totally normal. I like being with friends or family, but I like to be alone playing online games or being on Tumblr as well. Depends on my mood.

I got given the opposite advice to you. I was told by friends who'd already left the family home that it was going to feel weird for a while but then I would love it. My experience was the same as yours, though. Day one was bliss (so much so that I saw the need the celebrate with champagne).

Getting home and closing my front door is still one of the best parts of my day.

Actually, it's quite normal to be happy alone, and, when you think abou it, you're never really alone, you're with yourself. Being comfortable with yourself is a gift; enjoy it.

I do enjoy solitude sometimes. People piss me off.

Private space is important for some people in some societies.
This can, however, and often does, lead to emotions of isolation and loneliness, over time.
This is why we need to rethink architectural design. For more 'westernized' societies, togetherments instead of apartments, where there is shared space in kitchen and dining areas (and others), but with an adjoining private space for individuals who prefer this lifestyle. If designed cleverly, there might not be any immediate neighbours.
In this way, you can have the best of both worlds. If you choose to avoid the others (for a time), then you can simply use a private entrance, and obtain prepared meals elsewhere.(Perhaps, a small refrigerator, microwave oven or toaster oven in your private space).

You are a textbook introvert, completely normal and fine.

Living with two people, one of whom I'm in a relationship with, and one a half decade long never ending best friendship, in a one bedroom apartment, makes for some much needed alone time. Up until a week ago of this current lease, I started to feel confident for the first time in such a crowded living space. I was plagued with what i imagined they thought about the way I spend my "me" time. So afraid, in fact, that i was losing myself. I was feeling inferior because I thought I wasn't good enough. I'm not a calm silent math major, and i'm not a drunkard skateboarding socialite. Who am I!!? It got me actually feeling quite depressed. So I rarely could have the healthy amount of alone time to gather my thoughts and recuperate, all out of insecurity. I realize though that these are people I love and want in my life, for as long as I they will let me have and love them unconditionally, and that is the exact mindset that should allow me perfect freedom to be myself. There was a time I thought I would feel much better in an isolated living environment, but this is just a loving environment. I've gotten used to living with people when I used to be someone who was uncomfortable with a breech in my "me" time. What would they think of me in my natural habitat?!@$(@
Living with people with varying hobbies (and gender from me) allowed me a learning experience and life lesson I can't put a price to. But I initially was thinking on congratulating you with absolute kudos for feeling like a boss and living alone. I like you as a human being and relate to your last few sentences immense. Feel okay with your introverted paradise. It's a gorgeous place with 70 degree sunshine weather.

After college I lived alone for two years and I enjoyed it, but I always wondered if I was missing out. Then for two years I shared an apartment with roommates and by the end of the second year I finally realized how good I had it when I was alone. So now I live alone again and would never consider sharing a place unless it's with a partner rather than a roommate.

The only thing I do miss was how much cheaper it is to share. The size of my bedroom at the other place was the size of my entire place now, and I paid less per month for that one.