A few thoughts: first, somebody likes you. You’ve had friends in the past.
Second, no one is looking at you strangely when you try to be friendly or say hello. That is what you have come to believe because things haven’t been working out as you hoped.
Have you tried getting a campus job? What about volunteering? What about checking out the campus chapel and groups associated with it? All of those opportunities are likely to lead to non-judgmental interactions between you and others like you. Working on campus is often a great way to meet people.
I remember your other post, and I think some of these suggestions were mentioned. If you are happy with everything except the social aspect, I suggest you find volunteering opportunities as soon as you get back to campus next year. Meanwhile, is it too late to find out if you can volunteer with the next batch of incoming freshmen? That might give you something to focus on, instead of worrying about your situation. I suspect you are too centered on that, which isn’t helping things.
If none of this appeals, consider transferring.