You're right, honey, some guys will tell you anything they think you want to hear to get into your panties. Not all guys are like that though. But of guys at your age a bigger percentage are driven by hormones and they don't yet understand the harm they do by lying to get some sex.
Keep in mind that there are a few good guys who would not stoop to such tactics. There really are. And guys don't have to be the jerky kind to be interesting. It's just a myth that only "bad boys" are good kissers.