Is this a weird thought that I keep having?

I got peer pressured into having sex with 5 boys who were of similar age to me. One of which I had previously had sex with and two of which I had previously had a threesome with.
I met up with the two I'd had a threesome with to do it again but they had brought more people than I was aware of. However I didn't know until I got up from giving one of them a blow job but as soon as I turned around to see all the others I froze for about half an hour and didn't know what to do. I no longer wanted to carry on but then I felt pressured like I had been keeping them waiting for too long so I said yes. I felt so terrible after and have since classed it as rape and I still see it as rape (even though I blame myself)
My actual question is though. Is it normal that from time to time I feel like I'd want to experience that again not being pressured but like having sex with more than one person at a time possibly with the same people considering I haven't done that since, even with different people, and like I also sometimes feel like I should get over it trying to convince myself that it wasn't rape so I could enjoy what happened. 
Do you think this also might just be that I either don't class it like that but know it's classed as rape or have I maybe just not properly let what happened sink in?