Please help!

Fizzy

So the last time I had sex was a year ago by my ex who raped me. I’ve been to nervous to do it again. Getting fingered kind of hurts and I can only orgasm from clit (which I know is normal) but I want to feel pleasure from sex. I’ve tried a dildo but when it goes up there’s pain in my lower back and tummy.... why is this? Its not even big! I now feel mentally ready to have sex with a guy I trust but how do I stop it from aching inside me? I just want to feel pleasure 😩😂