I want a more boyish, higher and younger voice but not sounding broken because I have a young face to start with. I want to know how I go about doing that, whatever it takes to do so.
I recommend you work with a voice teacher in your location, wherever it is you live. I am not a person who likes to decide on a sound and then manipulate the voice to achieve it. My strength is in developing vocal function and then determining what the voice will be most able to sing beautifully. Whatever you do, love your voice and honor the function it is designed to have — in that perfect function is the grace and miracle of your self-expression and your relationships.