I think you might be being too hard on yourself, the drawing looks great. There might be a few things that aren't perfect, one of the eyes and one of the ears look a little bit off, and I think I'd make the lips a little bit thinner, but that's just me and I'm not very good at drawing so what do I know? Haha.
Yeah right I thought it wasn't symmetric enough as well, gotta improve that, thank you so much <3