Painful or feel nothing during sex

Hi, I (20F) have been with my boyfriend (26M) for 2-3 months now. Sex felt great with him at first but it’s been maybe 2 weeks or more I don’t feel anything when having sex but if I do it’s only pain. My sex drive has been close to nonexistent. I tried using a vibrator while having sex but I couldn’t get myself to orgasm and I end up stopping it because it’s too painful and get pretty red down there. There was one time where it was so painful I had to put ice and it was bleeding. Can anyone give me advice on how to fix this or why it’s happening. Thank you.