Feeling lonely

Just checking in to see if anyone else feels the same way. I'm a 2nd year and feel that I have no real friends. Everyone else seems to be consistently hanging out with other people and I'm never included in much activities. It's probably my personality since I'm socially awkward and anxious. It seems that some of the people I tried becoming good friends with at the beginning of the year rarely keep in contact with me and that I'm being excluded. I know I shouldn't care so much and that I just need to focus on school to get out and into a good residency program. But FOMO is real and it's hard to not feel down about myself. I just want to see if this isn't as uncommon as I perceive it to be