Yes I agree it is scary on the amount of debt. However, the more I think about it I ask myself what are they going to do? Call all the debt in? Heck we owe the most debt to our own government (probably a third). Most people don't realize what we owe China is a drop in the bucket. Will something happen eventually? Most likely but none of us know what, when or how. The most concerning part is we aren't doing anything to change our habits. We keep going into the red further and further and further with no plan.
As for the stock market I go off historical data. History says the stock market will average around 10%/yr over a 30yr period. Investing (in the stock market) is more about patience and discipline than timing. A lot of money is made and lost when people freak out because of the rise and fall. I invest heavily during down times because it always comes back.
Either way you and I are in the minority. If we had more people our age in a forum actually discussing real topics (instead of the new Playstation Football game or who got voted off Big Brother) we might could start digging out of the hole. The problem is I don't see anyone trying to solve real problems. Instead they are redirecting our attention to Black Lives Matter, NFL players not standing for the National Anthem, etc. etc. I fear something bad will need to happen for our generation to want to stand up and fight for the country that is slowly slipping away from us.