That really stinks that you have unfortunately found some of the most self-centered people in the world. I think it is a symptom of THEM not wanting to say “no thank you” and rationalizing that ghosting others as the easier thing to do for THEM if they really didn’t want to get to know you. Screw those kinds of people! Please know that there are people in this world who find ghosting extremely off-putting. The only acceptable time to ghost someone is AFTER you have already ended the friendship/relationship and they continue to pester you since they have already been clearly informed that you are not interested.
As a person who is highly introverted, yet still desires contact with high-quality people, I do continue to put myself out there strike up new friendships with like-minded people. If you are relying on dating apps to get dates, I would say to remove those from you phone and just seek walking, running, hiking, table top gaming, etc. groups to meet people in a low pressure way. That is what I did and how I met a lot of people who I consider friends that let me know if they can’t come to a gathering for whatever their reason. I joined lots of groups until I found my people in a city of about 120,000ish in the USA. It may take a long time to find your people, but when you do, you know.
I agree that simply not telling someone “no” and leading you on is definitely the a-hole thing to do and that not all men are dangerous. As an outsider to your world, my question is, have you ever heard the saying “if everyone else is an a-hole, then look in the mirror?” I am not saying you are a bad person at all. What I am saying is that if everyone is ghosting you that you meet, there must be a reason that this is happening to you that you are unaware of. I think of my brother-in-law who is a large imposing scary looking dude that looks like he could beat the tar out of anyone. He perpetuates that appearance by how he chooses to wear his hair & beard and how he chooses to dress. However, once you get to know him, you realize he wouldn’t harm anyone with the exception of self-defense. Other times, it is just a vibe that people give off that make them seem like a bad idea. I personally think about a guy that my partner was friends with. When I met him the first time, my creeper radar was going off, and I couldn’t figure out why. I set that aside because he was my partner’s friend. Down the road, we found out that he was extremely emotionally manipulative (probably a sociopath) and was dating young women 18-25 while he was 40. We saw that emotional manipulation based off of observation when he was around his partners and also when we learned some very personal and private things that he was doing with said partners and how it made them feel like they were the crazy one, being gaslit, etc. One of his partners was a newly licensed therapist, and she was unable to see the emotional manipulation until AFTER she got away from him. I am not saying this is what you do, since I do not know you. However, if you give off a creeper vibe (even if you are not a creeper), then that can cause large swaths of the population to ghost you. The entire thing just sucks, and I like to give people I meet a fair shake to show me who they really are because more often than not, you meet some seriously fun people to be around. Do note I am very much a nerd and enjoy table top games, video games, computers, and things of that nature therefore, I am used to interacting with people who are not consider conventionally beautiful/hansom always. The other things to consider is, are the people you approaching in the same league as you? Whether we like it or not, people will judge you based off of your appearance. If you try and get into a friend group or date someone much prettier than you, then that probably won’t go well.
Sorry for the wall of text. I ran up against this problem when I was in middle and high school because I kept throwing myself at the pretty girls to be friends with and couldn’t figure out why I had no friends. Then I got in with the theater and band nerds and found lots of friends. The same is true as I moved cities and instead of looking for the beautiful people, I looked for the gamers and found my people :) I do sincerely hope you find some peeps of your own. It has gotten much more difficult to that though in this day and age with people so tied into social media and not doing things in-person out in the world the way that we used to.