I'm sorry for what you're feeling, but just to let you know, that you're not alone with this dilemma. There's nothing abnormal about you, just because you can't have a significant other at 17. As previously mentioned already, chances are, it is likely that it wouldn't last [and possibly have a bitter end] *if* you do find yourself in a relationship at your age.
As per your previous post, getting involved in your studies and extra-curricular activities that interests you, for the time being is a very good idea. Who knows? What starts out as a hobby might turn into something more lucrative for you in the future, and possibly find a decent gentleman who might happen to share your interests in the process.
For example, I knew a guy who went through a painful break-up. After spending some time in my household, he took an interest in my guitars. Before I knew it, he was in an apprenticeship program that landed him a job in repairing stringed instruments at the local music shop. He became so good at it, that he had worked on my guitars too. That was three years ago and he no longer works there. The last time he corresponded, he claimed that he had enough knowledge to build a guitar entirely by himself, thus he enrolled in a luthiery school somewhere in the Pacific Northwest. Oh yeah, he also said that he found someone who also shared his interest, and they plan on setting up their own business once they get out of guitar school.
Who knows? There are other things that interests you [not guitars], and his success story just might be yours as well in the future. Hope this helps and good luck.