Help with life issues?

People say life will get better and u will find the perfect someone... but what if u cant... I try but cant seem to get the right girl... They use me then stop talking to me.. total bitches or plainly lead you on and then plainly stop talking to you totally... how can u say your find the perfect someone when you try and always fail at it... i really hate this and dont know how im going to handle this anymore Help please?