Not going out on first night of uni

So I’m at uni now and I found the moving and leaving my parents really hard. I’m just feeling really tired and sad rn so I turned down some invites to go out from people. I haven’t even met my flatmates yet because they’ve been gone all day and then suddenly I heard them talking super loud outside my door and was too scared to go talk to them. (Not sure if it was multiple of my flatmates or just one who brought friends). I’m starting to regret not going out because of fomo and the loneliness of sitting here alone in my room and hearing the sound of people outside chatting. Is this something that’s going to impact largely on how I’m going to make friends in the future?