Is there any way I can delete my account and posts that I have made

no you have to live with it unless you're European then you can probably claim GDPR or something

I made posts that contained my email when I was way younger and I'd rather not have that out on the internet :/.

oh you can just edit your posts or a staffy boi will help you out eventually

For some reason there isnt an option to edit the post

if that can make u feel safer, u can google ANY existing email and many sites will pop up, ur email is much more known then u actually think

Yeah, I'd just feel more comfortable if it wasnt here. It's a shame the staff don't care enough to help out.

Deleted the E-Mail out of your post, If you find any more please link them to me in pms so i can delete it