I have to remark that one thing is that your family and friends know that you're doing something, and another thing is that they're interested.
From my experience, is better that they are not interested. Have in the public someone who you know, may stop you from show or even do many things that you think they can dislike, or do things just to please them 
You can't know what other people may or may not like of your work, but you can have that solely person that you personally know stuck in your head while you're drawing or posting and be thinking "If I show this, they gonna say that..." 
Believe me, all what your parents and friends need to be able to respond if they are asked is "Oh, yeah, he/they/she likes to draw" and not far more 