Open Question: How can I treat psychological erectile dysfunction?

Hello.
So I have a question.
I was assaulted a few years ago…and I mean I’m fine and nothing became of it…other than the fact it was pretty scarring and when I’m with someone I get very aroused, but if they go near my penis, I won’t completely lose my erection, but it’ll get a bit limp.

This is really upsetting me… I am perfectly fine when I’m on my own, and I get very turned on by my lover. I was very nervous at first but eventually I let them go farther with me, but this problem is repetitive. At first I was actually in tears I was so scared, cause all i could think of was the incident.

I want this to be cured ASAP…but I don’t know what to do?
Will experimenting like I have been slowly get me back into the game?
(I was perfectly fine with people before the incident)
Is there something I can take?

Thank you

(I’m 18)
Source