How can I tell parents and friends without being too awkward?

well if nothing has happened to you to make you not want a girlfried, it that simple. just tell them that having a girlfrien is just not what you want right now and that you dont want to be pushed. also, depending on who is telling you this in your family, ask them why they are so concerned about your life? yes, they may love you, but if they love you enough they should be able to except you life choices. and dont worry about it, my brother and some friends are the same way. your only 20, you still have awhile befor worrying about never having a girlfriend. you could always change your mind or find that right girl.