I wish my voice was deeper.
What is the problem?  I haven't heard anyone who knows you criticizing the tone of your voice.
It's something I've wanted for a long time.
While we all have parts about ourselves that we wish to change, changing your voice isn't something that is possible since it's the result of the size of our vocal cords. Rather than focus on something that you can't change, try to focus on other things that can boost your self-confidence. When you are satisfied with yourself, you will be more accepting of your natural tone of voice.
So I should just fake my voice?
No, that's not really what I meant.  I just meant to concentrate on your other strengths, and remember that the tone of your voice is insignificant compared to them.  Remember, most people don't really even notice your voice, and they don't judge you on it.