Alright. I'll bite.

OP, I think you're over-thinking this. From what I can tell, you seem like a sincere guy, and there's nothing wrong with that. That's a good quality. But throw away all the "society" level thinking. It's not helping you. This is a personal issue. Society isn't making you into who you are, and your isolated case is not affecting society. Your own behavior, patterns, and choices make you who you are. So let's focus on you.

I'm going to give you some unsolicited advice. I'm old. I'm a veteran of all of this man/woman/relationship stuff. So this advice is coming from a good source. Yes. Women do like the alpha male personality. But here's the thing. You don't have to be 100% alpha. Even if you're 20% alpha, you can be successful.

You don't have to change your personality from top to bottom. I think you just need to change your approach a little.

Here's two things that will help you:

First, a lot of "nice guys" suffer from a very particular personality trait. They are afraid if they rock the boat... no one is going to like or love them. I want you to think about this real hard. Why is it that you are nice to people? Is it because you are naturally, genuinely nice... or is it because you feel like you should or you have to be nice to win their approval? Think about this real hard. I mean, spend days thinking about it. You might discover the root of why you feel you can't be yourself around women or certain other people. People (women included) aren't always going to abandon you if you speak up for yourself, or if you assert your point of view. Try it. Work on this more. Defeating this line of thinking is really hard, but it's worth the fight.

Second, don't assume that women want someone who does everything they want, when they want it. In my experience, they like it when a man makes a few decisions for them. For example, when you ask a woman out, don't say "Do you want to do something on Friday night? Where do you want to go? Anything is fine with me. I'm flexible." Instead, say, "Hey, I'm going to the LSU baseball game Friday night. I have an extra ticket. I would like you to come." This shows that you are going to the game, regardless of whether she goes or not. You establish yourself as a man who does things on his own, and she's choosing to be part of the adventure.

That's not a huge alpha move. That's just a little alpha move. You have to admit, you don't have to change who you are to do that, right? So do it.

OP, you don't need a radical overhaul. You just need guidance, man.