No, it is not your looks at all. I think that one mistake people make in dating profiles is including too much specific information up front. For instance, some people might see that you're into anime and be turned off. However, it might be different if they discover that after you meet and hit it off.

I would focus more on what you think you have to offer other people and not say too much about what you do or don't want - a couple of sentences is fine. Your profile is basically an advertisement for yourself to attract other people, so focusing on what is negative about others can be a big turnoff as it sounds bitter. You want your profile to include enough info to attract people you might like but omit enough to leave some mystery. It's like a movie trailer- the best ones give you a good sense of the movie without giving away the whole plot - and plot twists. This stage of dating is the same way, it's best when you know a little bit and can't wait to find out more.