Is it wrong that as a teen, I worked in a tailor shop, and after hours I molested a female mannequin and nutted all over it?
That sounds inappropriate. Why did you do this to a mannequin.
I just felt the urge to do it so I did.
Ejaculating on a public object is something that you should ever do. It's unsanitary as it can give other people diseases, and you did it at your job so you would immediately be fired if someone found it. You need to control your sexual urges when working and in public.
I'm over it. I don't think about it anymore.
Ejaculating on anything in public is highly inappropriate and in most cases can get you arrested. Hopefully you have matured mentally and are able to control your impulses.