I can relate to struggling to make friends on a university course... It can be a competitive space, and I found that I had to eventually decide that my student cohort just weren't "my kind of people". I was just very different, and had very different interests and beliefs. I really disagree with your neighbor, because other spaces were much easier for me to form friendships in.
You may not be doing anything wrong, in wanting personal space and speaking your mind. It may just be that you haven't found the right people to appreciate you yet. For me it was more about getting involved in volunteering, activism and stuff like that... for you it could be more related to your soccer.
So I say keep exploring and those friends will show up, it may be that graduation is great for you and exposes you to a far wider range of people. I hope you find good people!
Are there any other hobbies that interest you?
"In between two tall mountains there's a place they call lonesome.
Don't see why they call it lonesome.
I'm never lonesome when I go there." Connie Converse - Talkin' Like You