At least you learned your lesson at $100 some of the people I know lost thousands of dollars to learn that kind of lesson, one thing I can also say what mistake I've done before was trying the futures, when I started I don't exactly grasp its concept until later when I found out that if you lose it, you lose it.
In most cases, traders never unveil the actual capital they have lost; There could be different reasons behind that but what I am guessing is, to avoid embarrassing, they do tell something small.
It meansThe point which pushes me to contribute here is, learning a lesson at what cost is insignificant and the lessons are also insignificant because these are most common things we do come across with many traders of this community.
What is most important is, not repeating the same kind of mistakes. It applies to both actual trader and others who get some knowledge from the same incident. Because, the next incident for the same lessons may not happen for the same amount, again how much capital is not important here but not repeating is most needed.