How do I say no to a prom date?

So this past month has been really rough for me. I ended a year long relationship with the love of my life and then I was raped on a first date a week after the break up. To say the least this has really messed with me mentally.

Prom is coming up in a few weeks and I planned on going with my ex before we broke up. Now obviously that is not happening.

My mom kept telling me I need to find a prom date (since it is my senior prom). But I don’t want to find one. I think I’m a way not having a man on my arm would prove to myself I don’t need a man after everything that has happened. Sort of like a symbol of my recovery and strength.

I went on a first date with another guy and I liked him. My mom kept pushing me to ask him to prom. So I did. And he agreed to go to with me.

Well we have seen each other for about a week now and he’s calling me his girlfriend. I am so terrified to open up again and honestly I don’t want a relationship.

Now I feel stuck to go to prom with him.

Do you think it’s ok to tell him I’m not in the best mental state and I just want to go alone and maybe just be friends? (He knows my past with the ex and rape)