**Trigger warning because SA is mentioned**

Hello all, for some context, I am 25 M and want to know if I am an asshole for hitting somebody after they sexually harass/assault me. I feel like the answer should be obvious but after a recent event, I feel kind of invalidated, so I want your opinions. I have a friend (25 F) who is a very touchy/affectionate person and I am simply not. A few months ago we were at a friend's house and she kept trying to be all over me and sit in the same chair as me/on my lap and I kept pushing her away & asking her to not sit in the same chair or on top of me, and she just laughed it off and I eventually got up and moved to another seat. A bit later, she tried sitting on me again and I was physically shoving her off me and she even grabbed my butt at one point which makes me extremely uncomfortable - and she knows this, but continues to do so because she thinks it's funny to irritate me - meanwhile, my other friend sitting next to me (also 25 F) told me to calm down and stop making a big deal of it. I've resorted to physically punching her (arm, stomach, or throat) when she touches me inappropriately, but it doesn't seem to stop her - she will just make a joke out of it. And of course, everyone freaks out when I hit her, but ignores me when I explain that it was essentially self-defense. I feel that it is justified, but am I taking it too far??

For some more context, I know she doesn't have a crush on me or anything (not that it would excuse this) because I am gay and everyone in my life knows that. I think she thinks it's okay *because\* I am gay? And I can't tell if nobody bats an eye when she SAs me because I am a guy? or gay? or because they know her to be a close friend of mine? But I have told her so many times in the past how uncomfortable it makes me when she does things like this and she never seems to respect my boundaries. I don't want to end our 10+ year friendship over this but I don't know what else to do.