I am a 13 year old girl with a huge problem!?

i am 13 and im just a little bit over 5'. not quite 5'1". i am goin into 8th grade. i started my period about a year and a half ago so im pretty much fully developed. i have a great a*s and my bra size is 32c. every guy i talk to tells me im beutifull and that they really lik me, but idk if they mean it. or if they just wanna get into my pants. do u hav any advice on how to tell if they are sincere???