Flatmates all getting along so well but I’m so shy

I’m at university (a freshers and am part of shared accommodation. I always hear try flatmates laughing and talking easily outside my room and it’s it makes really sad because I’m so quiet and can only do small talk with them. I try SO hard, I leave my room quite a lot just to make some tea as an excuse to sit and join the group... but I’m so bad at talking to them. Lately I’ve been leaving my room less, I still force myself to see them a bit every day but less often than before. Especially when I hear lots of people in the communal area, it makes me anxious so I just hide in my room. If there’s like two people, it’s a bit easier to join in, but often there’s like 7 people in the communal room and I can never say a word. They all just get along so well now and I feel so isolated. Hearing everyone having fun outside my door makes me want to cry, I sometimes force myself to join them but I can never say anything if theres too many people. And even when there’s only a few people, I’m still so shy.

My flatmates are so nice and I would love to get closer to them all... It’s just so awkward whenever I’m around. But when I hide in my room I feel awkward too, like what if they’re talking about me or thinking like “why does (my name) always hide in her room?”