What is rehab like?

I’m looking at a 4 week program, I’m a 23 year old female in Ontario. I just feel very anxious to go, but my body cannot physically handle it anymore, I’ve been to the loonie bin which helped but it was only 7 days. I don’t want to just be stuck in a room with my thoughts. I’ve been drinking heavily ever since I went to post-secondary at 19 and I really feel like if I get sober now I will never be able to have a social life. Am I crazy?