Feeling alone and depressed about love?

Ok here is my story I'm 24 never been in a serious relationship and only on a couple of dates. Lately slot of my close friends have been getting into more serious relationships or starting their families. And I've been feeling sad that I have no one to share my affection with. I'm not no GQ model but I wouldn't consider myself ugly also, though I am slightly on the heavy side. But what I lack in physically I make up for in personality I think. I've been told I have a great easy going and laid-back personality and a good sense of humor but I can also be really shy too. If I did ever finally find my true love I would treat her like a queen and be honest/loyal to her basicallly treat her with the respect she deserved. I've asked a couple of girls out but have been rejected everytime which has to be one of the worse feelings ever. To make things worse these girls would go after the good looking bad boy who treat them like **** and cheat on them if given the oppertunity. While the big nice guy with the big heart is left with nothing. So now I'm starting to think there is no one for me and I'll prolly be alone till I die. Which I don't think I would be able to live my life like that. I honestly would rather die young then live to be old and lonely the rest of my life. I guess I just needed to vent all my frustration right now because this man with soo much love to give but no one to give it too is feeling really depressed. What does everyone think and please be honest thanks for your time.