Take the time out to reflect on all of the troubles and challenges that you experienced . Now take the time out and appreciate the strength that you have to continue doing all that you can to succeed....Always Count your blessings!
Challenge yourself for change! Not for others but for your endeavors. Focus on what's really important. Remember you are capable of distinguishing reality from fantasy.
It's always okay for skepticism whenever it is healthy, but once you start to doubt the possibilities you may come across it's only a matter time that doubt will be a bigger problem in your life. Progress big or small still gets you closer to your goals. Keep on achieving!!