You're young and this is completely normal. You just haven't found the right girl... nothing wrong with that! Believe me.. the longest relationship I had before my husband was 8 weeks (but I spent 3 weeks trying to break up with him). When I met hubby, we moved in together after 2 weeks and that was 8 years ago.
At this point, do you want a long-term relationship? If not, fine! If so, try looking at the bigger picture. Are you picking girls that are very different from you? Not ready to commit themselves? Are you doing anything negative (not spending time with her, etc.) to ruin a relationship? I bet you learn a little something during each of your relationships... those experiences will help you when you meet THE girl for you.
