Stock Watch: How do you get over a failed trade?

Thank god it was just $100

I know this isn't stocks, I was just trying Bitcoin out for fun, it plunge 40% and I sold it at $60 and continued to go down to $49. Now it is at $62 and I feel shitty. Heck I even feel tempted to join back in again and speculate.

I know this is seriously sinful, but I kinda feel depressed over the failed trade and it's bothering me for awhile.