Mine will protrude quite prominently if I'm not careful. Training your voice is a good idea anyway and you seem to be more inclined to raise the apple up and inward. Years ago I started practicing pulling mine in more by raising my neck in a straighter posture, but I do have to think about it every so often or it drops again.
I love to wear turtleneck t-shirts in the summertime. But as with any girl, it's good to dress to emphasize your best features and draw less attention to your worst features, adam's apple or whatever.