I have been told I'm beautiful. I've even done some modeling. I'm a sweet person. Why don't the guys I date want a long term relationship instead of a f-buddy. Btw I'm 16?

You're young and the boys are very immature. You'll have to deal with this if you are that good looking. Just don't give in to any of them and the right guy with morals will come along and sweep you off your feet. There's a nice mature, smart young man out there, you just haven't met him yet!  You will!