Boys.....help

So I’ve been talking/hanging out with this guy, he’s a year younger than me and we kinda jumped into things pretty fast, went from kissing to full on making out in my car before school, during lunch, almost everyday, and I don’t want to feel this way but I feel more attached than I should, and I don’t know how to text him or anything, bc I just feel really needy, and I know he has other friends he can hangout with too and I shouldn’t feel jealous of that, BUT I AM. I feel like I’m being used, bc every time he sees me, we always end up kissing.