I can feel emotion, but it doesn't really come up much on my face or my voice, and I always sound very montone no matter how hard I try. This isn't good if I want to be an Actor, and I want to change it. Where do I begin?
You could listen a bit to female voices... their intonation goes more up and down than male voices... which activities would bring you in contact with your emotions ? Creative activities, like drawing, or writing, or photography ?
Imitate people. Actors, TV and radio presenters, famous speeches, even characters from soap operas Try to imitate how they're saying what they're saying, and keep practising.
Honestly I do not like the imitation approach so much... there are too many people, in my opinion, with a mask... you just feel that. In my opinion, if you can produce the emotions from within and radiate that outwards, you give a much more convincing appearance... Both ways are valid, you might try which one you like better... If you are really interested in the subject, have you done a little research on it ? There might be suggestions which do not make sense... but there might be suggestions from reputable sources which are really helpful...