Distrustful of Men

I feel sad that I am distrustful of Men. But I have been followed and made uncomfortable too many times.

Once in college I helped a random guy up after he tripped. I guess I was too friendly towards him. He then proceeded to sneak and see where my next class was. He followed me there. He sat right behind me and started shaking my chair to get my attention. I told him to stop and he eventually got bored and left. But I asked my friends to walk me home just in case he was waiting for me.

Another time I went to dinner with my friend. A middle aged man followed us into the resteraunt. We thought it was a coincidence. But he was waiting for us and got up the same time we did. Once we noticed, my friend and I had to cross random streets to loose him.

I went to a grocery store with my mom recently and a middle aged man was staring at me. I moved to another aisle and he followed me. I tried to avoid him without drawing too much attention but he kept chasing after me. I tried to get a cashier's attention but eventually I just suggested that we leave. I didn't want anything to escalate with my mom near me.

This happens almost every month on top of being flirted with by men who are probably my dad's age. It is so unnerving. I try to not let it bother me. But honestly this really hurts. I just want to be left alone. Do you have any advice on how to deal with these situations? I feel like I just try to reduce the possibility of escalation every time. But it's extremely stressful.