Questions: Girl's Behavior

So I was texting a girl I like the day before yesterday and we talked about dating apps. A little context about us: I started developing feelings for her during our last year in highschool. I told her this some time ago and she was sweet about it. I didn't tell her in a flirty way or anything, so I'm pretty sure she doesn't know I still like her. Anyways, she told me she downloaded Hinge (wee woo, I know, bad news for me). She then continued to criticize her appearance, to which I replied that if she doesn't have a chance, I have absolutely none at all (just a joke to make her feel better about herself). She thought I meant that I had no chance at dating her. I replied that I meant dating in general, but that I probably had no chance with her back in highschool because she wasn't interested in me anyways (all of this was said in a jokingly way, not anything dramatic or serious). To my surprise, she said: "Well, I didn't know you were interested in me back then". I replied: "I'm confused now, did you have feelings for me?". She answered: "Well, I never thought about it. Not about anyone in school actually. I think everyone thought I was weird". After this, she said she only downloaded Hinge to see who was in her area and that there was nothing more to it. We continued on the topic of how weird our school was. That was our entire conversation. So yeah I'm very confused by these mixed signals. What do you think?

Its a very tough topic to talk about but I (26 M) sometimes do experience sexual harassment.

!! Before going further I do acknowledge that girls experience this from men as well and I do not want to deny this, I merely want to open up the conversation that it can go both ways!!

But when I talk about it with my friends they usually laugh it off because I'm a guy and specially female friends are like yeah I really doubt its close to what I'm experiencing.

Now with small stuff I'm not too bothered, like a girl when shouts like take me home with you when I'm out is kinda funny and easy to brush off. Although there are things that go too far. One example is that when I arrive at a gym I have girls staring at me and aggressively trying to take a peek when I'm changing clothes (it has subsides since I go there once or twice a day now and I'm quite a regular). This stuff does creep me out.

Also sometimes when I walk in jogging pants or something loose some girl will randomly grab my ass. This only happened twice in the last year but this really does cross a line.

The worst part is though that there is no right way to respond as a guy, if I get angry at her people will think im being aggressive to a helpless woman, and if I tell the truth people just stare in disbelief because I'm a man.

Now I will be honest that it's not the scariest thing to me since I don't go to clubs and I only drink water so getting something slipped in my drink is nearly impossible. I'm also physically stronger then 99% of other people I meet (men and women). But I worry since I have a girlfriend and we are extreemly prude with these things.

I wanted to ask for guys, have you ever experienced this and how do you deal with this? And for girls do you think this happens to guys and have you done it in the past?

And more importantly how to open up this conversation?