I'll give you some keys:
1) if you doubt, it means that you think too much.
You are probably obsessed by your thoughts, from what I read.
Since this is a compulsive behavior, I would suggest that you try to actively stop thinking, by practicing meditation, fishing or gardening.
2) you are so much afraid about failure that it pains me.
Probably in your past, you encountered people that were unable to cope healthily with failure (probably your parents, who wanted that you "succeed" so much).
Failure and success are the 2 sides of the same coin.
You cannot avoid any of them.
The healthy way to cope with failure is to accept it as a way to improve.
I would recommend that you try to fail small, to check whether the world disappears or not after a failure.
The real question is: what is success ?
3) "I have deep feelings for anyone who suffers or goes trough hard times."
This is bullshit. This is pity not compassion.
Most emotions are similar to thoughts.
If you stop thinking, you'll notice that fake emotions tend to disappear.
You probably try to control your emotions, which makes the whole process difficult to stand.
Try to be more "natural", in other words more sincere with your emotions.
4) I feel a lot of lack of self-confidence in your message.
Bragging about this and that shows that you are too attached to what others think about you.
You still believe that you can please them, instead of yourself.
In reality, self-confidence is detached from any external achievement.
I guess you didn't meet the correct people to help you.
Try to find somebody who can help you. Avoid charlatans and gurus. Find somebody that you feel can relate to you.
And please, try to not think too much about what I wrote: be more sincere to yourself, and your situation will likely improve.