Every time I reflect on "what if" in my past, I get very anxious and sick, because I've made a lot of mistakes in my life. It makes me NOT appreciate the things

Every time I reflect on "what if" in my past, I get very anxious and sick, because I've made a lot of mistakes in my life. It makes me NOT appreciate the things and accomplishments I've done NOW and where I want to go in the future. I think mistakes are a part of life, we should learn to accept them, and learn how to grow from them.