"I don't feel like a real good friend" explains three conditions for us to be friends: first, feeling, second, being good and third, being true.
Because whether we are friends or not depends on our feelings, then what kind of feelings are friends needs us to determine first. Secondly, because it is a feeling, it is subjective to be with us. Third, we regard getting along with friends as an exam.
We overemphasize our feelings.
At the same time, the way to let people know is communication. We are rude and uncivilized in the way we communicate with people, and we basically don't communicate with people in our spare time, which will create barriers.
Therefore, what we have to do is to civilize our manners and language and take the step of communicating with our classmates.