"One of the marks of excellent people is that they never compare themselves with others. They only compare themselves with themselves and with their past accomplishments and future potential." - Brian Tracy
We all have accomplished certain things in our lives. Yet sometimes we do not interpret these accomplishments as positive, or we forget them and consider them unimportant.
Your past accomplishments are proof of your identity as Achiever.
Consider what you have accomplished in the different areas of your life: Academic, Career, Social, Relational, Sport, etc.
Be proud of yourself. There are many people who would look at this list and be impressed. Even if they are not impressed, they certainly would not say that you have accomplished nothing. These are the things that you have achieved, and they indicate that you will still be able to do more in your life. You are older smarter and wiser. You have the potential and you have a purpose for your life.
Expect that your future holds many more achievements.