That was some common mistakes I've made too when I started trading. 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. Unlike buying normal coins, you get a hold of that asset (no matter what the price) in futures, it's like placing bet, once you lose, you lose.