I think 15 is quite young to be having sex because even though you may think that you are mature ( and you may be to a certain extent ) it's just there's so many STD's out there and having sex at a young age could start a bad habit for you. It always makes you look "easier" to guys which does not look good. I frown on it only because you are so young.
I had sex at 15 ( almost 16 ) and I don't regret it. But I had been with the same guy for over 2 years and I knew that he was a virgin as well. Soon afterwards the sex had got the best of him and we broke up over it. Look, you have the rest of your life to have sex why not wait until you find the right person to have it with? The right person isn't going to push you into it or be mad at you if you don't. Make sure it's something that you want to do. I'd be exploring my own personal gratification if I were you instead of worrying about sharing yourself with others. Do what makes you happy, just stay safe. Wear a condom at all times when having sex, and start birth control if you can. Why don't you talk to a guardian or someone close to you about it that's not your age? Often a will to want to have sex is a cry for attention; not necessarily an urge to have sex. Think about it before you do something. My best wishes for you and your decision.
