Well, I'm certainly no doctor or anything, so I suppose these thoughts could be connected to your mental health for all I know. But my immediate thought in reading this is that, in part due to lack of social contact and the self-esteem issues which that can bring, that you are a bit more sexually awkward, repressed, and unsure than you would be otherwise. I have also heard that some deviance can be associated with repression, so that might tie in a bit.

However, the main point I'm making is that sexual fetishes are really fairly normal. Most have fantasies, although they aren't always openly discussed. And since the only information you've given me regarding these fetishes is that they aren't illegal and wouldn't hurt anybody, I'm not too concerned about them. You're a young man and having a strong libido and thinking about sex is normal - particularly if you're not getting it. If this is getting to the point where it's really disrupting your functioning or causing you to be tempted into criminal acts, then you should probably bring it up with your psychiatrist (you might anyways for reassurance). Otherwise, they sound okay to me.

Heck, if you think that's bad, you should hear some of mine.