How do I know if i'm the problem?

The other seniors on my team exclude me from everything. It started when I was the only one in our class invited to states. I'm not 100% sure if that it the reason though. For whatever reason they don't invite me to everything. I even invited them over to my house for a party and the next day they all went to the beach. Tonight was our graduation and we had to do it in groups for social distancing and they created a group and took pictures and I was the only one not invited. I want to know if I'm the issue or if it is something that is out of my control. I don't want to go to college acting the same way if that's what drives people away from me cause I can't spend another 4 years feeling the way I do.
How do I know if i'm the problem?
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