Sounds like you're fairly young and couldn't imagine a long term relationship. I know when I was your age I couldn't imagine being with someone for an extended period of time. It could be your intimacy isssues too that affect this. So, I wouldn't worry too much about this. Also, sometimes it takes people a while to sort through these feelings and realize what there sexual orientation is. I know it took time for me. I hope I've been of some help.