Hmm, in response to Dooger, I agree with you! I definitely LOVE to look on my past mistakes, as it becomes clear what I've improved over time and where. If I had nothing to compare my newest drawings to, I would honestly be in the dark about a lot of my own skills.
And no matter what--if you've been practicing consistently--over a period of time, you will see that your drawings have definitely gotten better. No one gets worse with practice. Why get upset about how your art USED to be? That's the OLD you. This is the new, swaggier you! The old you would be shriveling in misty-eyed AWE if they saw what future them can accomplish nowadays. And at the same time, it'll make you look at your current art and go, "Well hey, maybe I'm not too shabby after all!"