@Ari-Sorokin I will echo everyone else here. I totally hear where you are coming from. I have been selling my art for a couple of years, and to this day, the first person to buy every new product is my mom. Every product! I've told her time and again that she doesn't have to, but it's her way of showing me love and support.
Also, look at it as a good way to get practice and hone your business without making a "real" customer angry. I have found numerous issues with packaging, mailing delays, etc. and because the first customer is my mom, I can fix it without anyone caring too much!
I hope you have great success in starting your store and I commend you for starting so early. I didn't start until my late 30's and wish I had started much earlier!
Hope this helps!