you gotta take the good lumps with the bad. I don't think the market will crash anytime soon, but we will get a much needed correction over the next few months as a downtrend begins. We will see a bounce shortly, so don't fret too much. That being said, I pared down to 40-50% cash yesterday, and plan on saving at least 20-30% of that to use in late october.
The fact that you are in the market at 19, says a lot, and I applaud you for investing at such an early age. If you can't take the heat then get out of the kitchen, but if you are willing to stick through it, maneuvering through a bear market can be great experience for later years of trading.