If it's available to you get into therapy, I did a intensive course and while it's not the whole answer it gave me the tools and the knowledge to be able to work on my speech and I've put years of practice into it and while it's not perfect I'm happy I came from like you I couldn't hardly talk, say my name, call a taxi and definitely not speak to girls I'm certainly in a better place because I really wanted to be able to talk freely and while it was hard work it's so worth it I'm still working on it now but I don't get flustered or upset anymore