Help!!

Im 14 and guys always expect things from me. Like sex, fingering, blowjobs, anything sexual. Most of the time i want to do it and always feel ready (idk maybe bc im horny) but when i get the chance irl i back out of it. I really want to hookup w a few guys from my school and i feel like id be ready for it but i always back out. Any advice like at all?