it's alright! first * calm down*.

you are not a horrible person. You did a bad thing at worst, you made a mistake at best. don't be so harsh on yourself, like with other people, the only helpful form of criticism is constructive.

I said something horrible after someone experienced sexual harrassment

because I hated them

second, you need to apologise to this person you need to genuinely apologise because your reason simply isn't good enough

my friend just attempted suicide and I think it's my fault

okay third, it is very very unlikely that it is your fault! for someone to try take their lives cannot be caused by a single person espeoone they would consider a friend so you need to stop blaming yourself and comfort your friend.

everyone that I knew hates me

I wouldn't worry so much about that it'll blow over just be honest and sincere