I feel like something big is missing in my life, what should i do? :(?

Get out, try new things that YOU would enjoy doing and not a crowd, have alone time, do something peaceful like hike a mountain by yourself and have one of those self searching moments, date, contribute to the world i.e. volunteer work, hangout with a more mature/less dramatic crowd of people, do something you've always wanted to do, get good at something not so common (skateboarding, guitar, singing, drawing, etc) yes those are common, but not everyone does it. Go to a rave, listen to new music that you actually enjoy (I remember when I was 16 I listened to alot of hiphop, rap, etc because my peers listened to that, but later on I found out that I personally really enjoyed rock, acoustics, and even techno. Might be something you relate to. Live for yourself and not your peers, start looking into your future, get into a serious relationship, start saving for something (gaming pc, car *those are what I'm saving for and I know once I have them I'll feel so good for actually acquiring them) roadtrip, eurotrip, NEW NEW NEW basically is what I'm saying and focus on who you really are as a person and not as a follower (I keep mentioning the "Follower" thing because I'm 20 years old and I remember that was one of my biggest problems when I was your age)