How does it feel having sex for the first time?

Kaelyn • Don't find fault, find remedy...
I'm 16 yrs old and still a virgin. I think I'm ready for sex right now, but really wanna know how it feels so that I'll be mentally prepared. I feel like if you don't lose your virginity before 18, you are not cool or something, probably due to peer pressure... 😳😳
Do you think it's better to have your first time after you turn 18 or before? Any advice for me???