That just what that one person's think. Not necessary true. And I doubt, coz it's seems people like you.

As long as you greet, smile and be polite I think you are fine. Everyone is different perhaps you are shy, but you are fine, and I think people in your class think so too, if they think like that guy do, perhaps they already gave up approach you.

Just be yourself, like you said, it's all male in the class, it may be hard to fine things to talk about to them. And also, you may be just a quite person.

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For clothing, as long as you are clean and tidy, it's fine. And from people reaction they don't have a problem with it.

If some people don't like you coz of your clothing, they don't really worth your time.

i know in high school it can be a bit rough, since some treat the school as a cat walk stage (my pain) . But if you are in college, it will get better, coz there are variety of what people wear. If you are in college, for those who still think this way, they don't worth your time.

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Since you broke your glasses do you have problem looking at the board when the teacher is writing notes? may be you want to sit in the front.

As for the job description, they all write like that "confident and energetic". May be you can try a volunteer job, and build up some confidence and have some experience to wrote down in your resume.
Also, this can make some varieties in your life. Perhaps you are just home -school-home, a simple life, and hard to fine new things to talk about.