Except for your age stated in your profile you sound rather like me. But I'm 54, and you're only 17; way WAYYY too young to be feeling as despondant as all that!!! Though it's still pretty common I guess.
I split up with my girlfriend too when I was 16 - her idea, not mine; she decided she preferred other girls to guys (which might explain all the times she had me wear girls' clothing).
Felt like the bottom dropped out of my life there for a while too, but I got past it... though I had other friends to help me with that. Fortunately I wasn't fussy about gender (just kidding - sort of

).
No one can tell you if there will be another special girl (I take it a special 'guy' is out of the question) in your life or how things will go. All that will be up to you. But you'll have to go and look for these things; they're not likely to come right to you (well, MY TUGs experiences in adolesecence did; they dropped right in my lap in fact - but not the ones I had later in life).
Sorry for all the platitudes (have plenty more but I think you get the point), but sometimes they're true all the same. Things WILL get better, but the chances will improve greatly if you keep a positive outlook and keep your eyes open to the possibilities around you. I bet you have opportunities you never even realized were there all along before. At your age you almost certainly have far many more than a balding, overweight, antiquated nerd like me.
You'll find that special someone someday; just give it time. Tomorrow is a whole new day.
I've been there at your age. I know what it's like. It happens to most of us, if not all of us. Just hang in there. It WILL get better.
Dare to be different... and make a difference.
To boldly go where no one in their right mind has gone before...