That often comes with time and experience. As you get older and get yourself through some positive and negative experiences, you lean what you can and can't do and those experiences mentally build up to enable you to handle the next ones that maybe bigger and more difficult.
Try to have positive attitude, and remember there is always someone else worst off then you. Life it's always fair, but things happen for a reason. Stay strong, you would be surprise what we can deal with in life.
Make chocolate chip cookies to share. When people ask who made them, you can proudly say "I MADE THEM!" Then start experimenting with other snacks and treats to share. People will then recognize you for not what you cannot do, but what you CAN do. That is what I did...
Now, I am being asked to cater church events with cheesecakes because anybody who has tasted one of my cheesecake claim they cannot eat any restaurant cheesecake ever again.