What went wrong during my time in college?

I recently graduated, and it is just so tough to accept I had an horrible time in college. I didn’t have a good time in high school and genuinely hoped things got better in college, but it did not. I tried putting myself out there more, but that lead to being rejected far more. I got denied from so many clubs, didn’t get any bids during rush, got rejected from friend groups and never got invited to any social events, and got mediocre grades. I reached out for help so many times, but it just never worked out