teens having sex

I see a lot of people on here dog teens that have sex. I'm a very mature teen, I'm 15, I've been with my SO for 2 years & we've been sexually active for one year. & I have no problems with it? I don't think I'm too young or whatever. I made my desicion & haven't regretted it. sex is natural. the only thing that bothers me about teens having sex is that most are having sex with anyone, if they get attention. I guess my point here is that if a teen believes they're ready to be sexually active, that's their choice, and they know they're body and situation better than anyone else. so why judge & be rude over something we don't know enough to even be judging about?