I'm no artist, but I'd say that as long as you truly enjoyed spending your time and talent on furry art, it's not a waste.

But I could have been drawing bards and soldiers and superheros and aliens. But I didn't. And now that I've grown up and want to... I can't. Just dumb fuzzy cartoons.

Oh Ticon, there is no such thing as wasted time. Only time that wasn't as fun.

You get over it by not falling into the logic trap called pointless regret. If you don't like doing furry art, don't do it. But don't bemoan it's uselessness compared to other, unspecified things you haven't been doing.

You can say it idc I know what you're gonna say anyways

And it's not so much about the time... But the effort and practice. I look at say... My human stuff I've been doing (and not uploading doho) and it's horrible. I turned into one of those furry artists I said I'd never be, and can only draw animals now because that's all I drew. It's a pretty shitty feeling