Definitely lost alot of money in stocks when I just started out investing so I stopped for a long time. Thankfully company provided ESPP and RSUs so I got lucky. And also lost alot last year too. For the long term as a kid in his 20s it should be all stocks or at least an index fund. Later in life, probably a safer mix of stocks and bonds I suppose although I’m still thinking only short term bonds.
Just have to play the averages long term – stocks averaging around 10 and bonds around 6 percent. Stocks are definitely more of a roller coaster though.