I agree, slow down and be careful.

"he has a lot of social interaction with friends too, whereas I rarely see any friends, so rely on him for my social interaction. And he has shared many of his interests with me.... but I haven't really shared anything with him.

This is problematic for me. Being dependant on him for socialization is not good. The solution to this is to seek out your own aquaintances and interests - and share them with your boyfriend.