You may be taking it too personally, soulgaurd. In these modern days most young people in college are used to communicating and being social online rather than in real life- what I mean is, I think a lot of people have forgotten how to be friendly and pleasant in real-time. If you make a comment to a stranger, trying to strike up a conversation, they act like they are in danger or something. I think it is probably not you that they are ostracizing- but all people in general. People seem (and possibly rightly) very suspicious of new people today. Even if you are introduced by a friend, it could take quite a while for an acquaintance to develop.
If you think you are being left out because people can sense that your values are different, that may be true. "Birds of a feather flock together." They may have an innate sense that you will not be approving of their subjects of conversation, or activities, or lifestyles etc. Then, lonely as it is, you are probably better off alone until you can find some people who would not be a bad influence on you. Easy to say, I know.
Try to fill your time with edifying reading and study, maybe take up a good hobby that would allow you to meet people who may be more your style. Maybe something with local meetings, so you can get out among people with a built-in ice-breaking subject of conversation. Some men here can probable give you some interesting hobbies to look into. Catholics are allowed to have wholesome hobbies.
Some of my personal faves: wood carving, leather tooling, model building, various kinds of horticulture and gardening, painting.
If this is not the kind of advice you are looking for, I am sorry. Interpersonal relationships have never been my strong suite. I spend a lot of time in solitary pursuits when not involved with family; but my temperament might be more suited to this than yours. Best Wishes. 1MT