Sex?!?!

Why do teenagers have sex?? Well idk either maybe cause they are stupid i am fifteen and im still a virgin i havent had sex. People have tried to get me to have sex with them but i didnt think it was right to have it especially at this age. Guys are stupid they think sex will prove their loyalty to you and everything when it wont it will just show that they are arrogant and immature. I dont think i can deal with a baby cause if i have sex i will get a baby you never know condoms break and birth control sometimes. soo there are always things that go wrong and complications.... Well the boyfriend i have been wtih is some what mature but he is 17 && i am 15. what should i do i need help!!!!!!!!????!?!?!?!?!!

what should i do??