Remember the good things that people have told you over the course of your life — maybe, when you achieved something or passed a goal post and how good that felt. In the moment, it is easy to forget and go on to the next thing. Always keep those good memories in your heart and mind.
It is so easy to remember the negatives and criticism. While improving yourself is a daily goal to work on, it is also important to appreciate what is working. This is something I have only started to even see these days. It will help you so much when the going gets tough. It is a little strength from people who have loved and/or appreciated you. Hold on to that.