Feeling sorry for yourself might be justified because of health issues, bad luck, a terrible family situation, or just the general unfairness of life, but it's a useless emotion and will only harm you.
Life is hard. Some have it harder. Some have it easier. There's nothing we will ever do to control that, nor should we try.
We can only control what we can control, and primary among those things is controlling what we are doing right now.
The past is unchanging. The future is uncertain and not promised.
Take action right now to make your life better.