At this moment, you can feel successful before you do anything. Other people would love to live the life you lead. Yet true success is not about comparison. Remind yourself that you set examples for others wherever you go and whatever you do. Even people you don't see or notice are influenced by you. As you grow more conscious that all you do matters, then what?
Enjoying life and feeling successful are grounded in how you choose to perceive the "here and now." You can be as content as you decide you'll feel, and you'll become as successful as you wish. You may have a history full of examples of suffering, tragedy, grief and loss. You could recount your experiences to others in ways that cause them to cry or, you could choose to develop a story of motivation, perseverence and triumph. How you choose to interpret and imagine things affects your morale, your attitude and the many ways in which your life unfolds.
What matters is how you feel. Results may happen as you envison or not yet, you always have a choice to focus on benefits of experience and what lessons you have learned. You are successful because you are alive and growing. No matter what your age, you have valuable experience behind you and opportunities in front of you. Anything that's ever mattered to you, all the people, projects or issues you've cared for, help explain why you're a success. You refine this success even now.
"When we strive to become better than we are, everything around us becomes better too." -Paulo Coelho