How likely is it that I'm bad?

[bear187]

A few of you probably saw my post a day or two ago about having lost my way down to 40$ from 160$ after investing 50$. I'm playing .5/1 on PP, and I've read through SSH.

Today I started out really well, I got all the way back up to 100$. Now I'm sitting at 40$ once again. Is this just variance? Or do I have some serious leaks in my game? I've been posting hands that I think I've messed up on, and the mistakes seem pretty minor, surely not enough for me to have 50bb swings daily. Is this normal, bad luck, or do I really need to re-evaluate my choice to play poker?