Let me tell you a story of two people i worked with ten years ago. Both of these individuals were the same age, and approximate intelligence. both wanted to progress in their careers. But, there was one major difference between them. One just talked and complained about not getting ahead while the other person took the initiative by taking courses, and finding solutions.
After 10 years, the person who talked and complained is still talking and complaining remains in the same position. While the person who took the initiative and found solutions has been promoted. what you have accomplished in the past is a much stronger example than talking about what you are capable of doing in the future