There is no room for regrets because there is still the opportunity to buy and hodl. The price of Bitcoin will still go up so we should take advantage of the opportunity at our disposal. I am sure in a few years people will also regret that they didn't buy at the current price. Yes, you lost a good opportunity to buy but it shouldn't be the reason not to seek advice from people. But we should always take advice from people that are proficient in the area we intend to invest. You are regretting that you didn't buy in 2016, but you might have lost it because you were not well informed about securing your coins. There is always a need to be grateful.
Are you a mama's boy? I feel bad because all of your decision in your life is always chosen by your mother.
When you're really want to eat a pizza, your mama will forbid it and say it's not good for your health. When you're want to hangout with your friends into a club, your mama will forbid it and say there's no good reason to go. When you're fall in love with a girl, your mama will forbid it because she's jealous and will tthreaten you're a rebellious child.
Learn to be mature and make sure no one can control your decision especially in financial.
His age when this event happened should be considered. Maybe he was young and depended on his parents for advice. Their advice on this matter might be wrong but I am sure they have been helpful in other ways. However, we must make our own decision and be ready to withstand the consequences, especially when we are not depending on anyone for survival or support.