Are you really sure you like this guy or are you just attached to him because you fear being alone? Your red flag popped then stay away from him.

Really, you're 16. When I was your age I had the same issues (no friends, loneliness, severe social anxiety). I don't think you need that relationship and I see it as a bit inadequate. Stand your ground, you're young and high school won't last forever. Join activities that you may enjoy, try learning a craft, do anything but be emotionally dependent on this person.

I'm not sure if this is an abusive relationship or if your both immature and your boyfriend is insecure, but I see an enormous potential when an older guy behaves with so much insecurity towards a teen. He should know better and behave with maturity and patience if he wants to date a teenager. While the age gap/legal issues other people mention could be present in a healthy situation too and no one would question, in your case it's worrying as it represents power or dominance in the relationship.