You can play whatever you want. Just some things will be tougher than others. CF is a pretty balanced game, but no game is 100% balanced. Orc is on a really bad part of that scale in most cases.

Also, keep in mind, your character will die. Age, con loss, or deletion. So one character doesn't turn out how you thought? Don't worry, you will be starting over. Only next time, with more info and knowledge under your belt.