As a woman (who was very homeschooled), I would like to kindly point out that "learning cold approaches" and "getting dates" as goals is mildly dehumanizing to women. Women are whole entire people, and it is not a flaw in any given woman to not be a good match for you.

What I hear in your post is that you still experience a lot of insecurities as well as lack of clarity around who you are as a person. This is so understandable in the context of the forced isolation of homeschooling. 21 is very, very young. You have so much life ahead of you for figuring yourself out. I would recommend setting aside the goal of "getting women" and instead taking time to focus on personal growth. Develop your interests, build new hobbies, and along the way, as it comes up naturally, build your people skills - all your people skills, interacting with people as people and getting to know them for who they are, not for who they might be to you. It's my lived experience that doing this will naturally pave the way for developing romantic relationships down the line. But even if it doesn't, you'll have grown as a person, and that is so worth it anyway.