The great thing about this life is that it is so uncertain. NOTHING is set in stone. Everyday we wake up with a second chance, a new opportunity. If you don't like who you are, or where you are then change it. Only you have the power to do so.
We all have goals, dreams, and things that we strive for. We should all do our best to reach our full potential, and be the best that we can be. It isn't easy, and you will have people who will try to tear you down. What they say, and the things they do shouldn't matter. Because this life is about you. It's about how you decide to live it, and the way that you treat people. People are what truely matter.
"When you are in the final days of your life, what will you want? Will you hug that college degree in the walnut frame? Will you ask to be carried to the garage so you can sit in your car? Will you find comfort in rereading your financial statement? Of course not. What will matter then will be people. If relationships will matter the most then, shouldn't they matter the most now?" -Max Lucado
So if you don't like the person you have become, or the job your at, or ANYTHING in your life... change it. Surround yourself with supportive people, and be a supportive person in return. Think about what really matters to you, and then go get it.