I'm sorry, it really stinks to spend all that time on something and then be disappointed with the results. I agree with those who are saying to put it away for a while. If you pull it out when you're less frustrated with it, it might not seem so bad, or you might find the energy to redo it.
I would never say people shouldn't strive to do their best, but I think sometimes the ideal of 'perfect' harms us more than it helps. I remember seeing quilts back in the '70s and a lot of seams weren't lined up and points were cut off, and everyone thought they were fine. I think the internet has helped to up the ante, since we can all easily look at not just the best quilts in our local sewing group but literally the best quilts made in the entire world. A lot of people post pictures of only their best work (and I don't blame them or anything), so we're often only seeing the best of the best. Even Rembrandt must have painted some bad paintings in his early days.