It's good to feel bad about something that didn't work out ... because you will remember it for the next time you perform the same task.

You can go through a ton of work to fix the problem or just live with it as it is and leave it as a reminder for yourself when you were just learning something new.

I wouldn't worry about it ... in a year or two, your successes will outnumber your failures. And all you'll remember is all the great work you did and seldom look back on little problems like this.