How do you know they all don't like you? have you spoken to them all? How do you know its cos you're rich? have you told everyone you're rich? (why would you say thet anyways, unless you wanted to portray yourself as arrogant)? The fact you think its cos your rich makes me think you relate all social misfortunes to the fact you perceive to be rich - in reality nobody cares, unless you start putting it in peoples faces.
You say its cos you're forced to eat at lunch by yourself, instead of assuming that people will come to you, how about you try and make friends by going to them? Make an effort to talk to people at your lectures/seminars, have convos with people you sit next to a lunch, join societies, visit your uni SU, etc.