Have I missed growing up?

Not at all, everone is different when it comes to growing up, and you dont have to do those things. With me I never had an interest in drinking, smoking, trying drugs, partying, i have yet to live on my own (hopefully will soon though). I barely have an interest in porn. I am the same age and gender as you so i see where you came from from not doing some of same things you mentioned. I didnt get my drivers lisence until one month before my 20th, and I barely drive and would only have good reasons to go somewhere. I am not worried about a getting another bf (i have only had one) there are many people like you who havent done all or some of the same things you mentioned. Dont let these get to you as long as your happy and are able to do things you enjoy and want to to do. You have your whole life ahead of you, and I believe you truely grow up all your life and doesnt stop at a certain age, some experiance things sooner than others and others later.