Do what you love and don't worry about age. You only get to live once. Do you want to spend years in a job you don't really like or do you want to take a few extra years of schooling to do what you love with no regrets. Go with your heart and you can't go wrong. It may not be the easy road but it will always go better in the end. Age is truly but a number
You worked hard and did the best you could. That is all anyone can ever ask for and for what it is worth, I am proud of you. Maybe you can take another class and try for that one again the next time around. We are all here if you need to talk