I know this might sound hard, but every time your dad says something negative to you, go to a happy place and think of something that makes you feel good. It seems like his negative comments to you and about you are what is really hurting your confidence. It also seems like to place a lot of weight on his opinion. I know he is your dad and you love him and that is great, but don't let his negative view of you affect how you see yourself. I know this is really hard to do. I always felt pressure from my folks and felt that I didn't quite measure up. It took me a long time, and I am still working on it, to see myself as a wonderful, beautiful person. One thing I did was put a post-it note on my bathroom mirror where I would see it everyday and it said "Be bold, beautiful" to remind me that I am a wonderful person. Just remember if you did the best that you could do, then not only is that all you can do, but that is amazing, because not everyone does.

Here's another suggestion, if you feel up to it, try telling your dad that his negative comments are hurtful, not helpful.