Single and too fat to mingle..

So i just became a freshman in highschool. I have never really had a boyfriend, which really sucks... i really want one but no one likes me... when i was in middle school i was 175 pounds and when i got to highschool i dropped 25 pounds and was then 150 pounds. I am definitely skinner than i was then, but i still feel the same. i feel fat. i feel like that gives guys a reason not to like me. Am i being to hard on myself?? i have had some friendships in the past few months that have almost led to a relationship... but guys just dont seem to like me. is it cause im big?? all of my friends are getting into relationships with such sweet guys, and im "Just friend Material" :/ should i stop trying?? should I care what they think?? why cant i get a boyfriend??