When asking a guy out, see to it that he is alone and not in a group so that even if he says no, you do not feel that embarrassed. If the guy already has a girlfriend, refrain from asking him out in the first place. Also, never involve your friends to approach him for you, as it shows that you are not confident. Lastly, even if you get rejected, do not dwell on it for long or spoil your mood. Simply move on.