How do I speak louder?

I get so frustrated! People never hear what I say, I have to continually repeat myself, over and over. It’s so annoying!

To me it sounds like I’m speaking loud, and that If I speak any louder I'll be yelling! I can’t tell when I’m speaking too quietly, but apparently it’s all the freaking time. Its very embarrassing sometimes and it makes me extremely self conscious during conversations with friends, family and workmates. it tends to be hardest when other people are speaking, it feels harder to make myself heard and I feel like I need to shout but it is still hard to be heard. I think it sometimes can effect me in the way that if the environment is noisy, id rather not speak so people don't have to deal with trying to hear what I say. I don't know what to do! :|
How do I speak louder?
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