I have this issue too. Part of my self-criticism comes from comparing myself with others and part of it is from my own internal expectations. I had a childhood where I didn't feel I was on equal ground with others, so I have always had a feeling of not being good enough. For me, that has been tough to resolve. I have this internal 'future me' that I think I should be and it changes as I compare myself with others. It is a losing game that causes me to beat up myself when I make even small mistakes.

To resolve it, I am trying to accept the 'present me'. I try to keep a daily gratitude journal. I write down 3 things every night that I was grateful for during the day. It does help change my perspective away from what I did wrong during the day. I am also trying to be more aware of when I judge myself harshly and redirect it to a more compassionate voice, such as telling myself: "Bullying myself right now isn't going to serve me in getting better; I have learned from this mistake and will move on from it RIGHT NOW".

I am open to other ideas. It seems to take rewiring your thought process.