I have always been very shy and introverted my entire life but I did used to have a large group of friends that I generally enjoyed spending time with. Two years ago I moved to a new city because of my parents jobs and since the move I have completely lost interest in socializing or meeting people. I spent my last 2 years of high school alone for the most part. I would go to school and avoid talking to anyone. A lot of people did reach out to me and invite me to different things but when ever I would go to a party I would never really enjoy being there and end up wishing that I had just stayed at home and read a book, watched a movie or played a game. The same can be said for work. I am 18 and I feel like I am wasting my youth but I don't enjoy going out and I feel like I don't have anything in common with people my own age. People find it strange that I am such a big loner but I am not unhappy at all and I just prefer to stay at home by myself.

My advice is to try to get a few friends and work up to feeling more comfortable with more people. There are also drugs you can take (prescription) if you have severe social anxiety that will help you get out there. Once you step back and see that everybody is scared to stick out and really they are too wrapped up I'm themselves to study your behavior you will allow yourself to be human and know you're just as good as anyone (and probably better because you are self reflective)
You only get one life so don't b afraid to live it - conquering our fears and making mistakes is the only way we humans learn. I know people who have not challenged themselves in life (I'm much older than you) and they are still as afraid as ever, and frankly they seem pretty unhappy. The only way to get over your fears are to face them.
Don't forget to listen to your gut instinct tho - it doesn't lie - don't put yourself in situations w people you get a first bad impression of - just people who you feel good about!!
Good luck! You can do it!
But if you don't feel negatively impacted by your introversion, then it might be best until you meet people who are interested in similar activities.