You probably have a lot of reasons not to quit, but I’ll just add another to the list. 

Starting over sucks.

Yes, setbacks are annoying, but I’d rather have multiple setbacks than have to full blown start over any day.

If you think about quitting and all your other reasons just aren’t convincing you, think about how it feels to start over. That should be a good kick in tush for you.

Don’t quit, because starting over sucks.