There's nothing wrong with you. There is nothing inherently interesting or valuable about having hobbies, outside of the enjoyment you get from doing them. And don't feel like a nobody - it's much better to have no hobbies than to be someone who goes on and on ad nauseum about whatever they're involved in to someone who has no interest. Plus, a lot of the people I work with are highly successful and are SO focused on their work (they're all scientists) that they really don't have outside hobbies. So don't use "hobbies" as a measure of personal success.
That said, if you are interested in having "side interests," by all means check out some of the extracurricular activities at your school or in your community. Take a look at what your academic or personal interests are, and get involved with things that match what you'd like to be up to.
And quit judging yourself
