Emotions prevent you from thinking more critically. When you decide for yourself in some situation, you are more involved emotionally. As a result, it is more difficult to make the right decisions.
Probably, it is easy to give advice to yourself if you look at yourself from the outside and objectively use your brains.
The problem is more in the implementation of this very advice. You know what is going on in your head, subjectively and from the inside, all the pros and cons ("I don’t want, I can’t, but after all, but what about, etc.), doubts about him and uncertainty, and therefore give advice / make a decision it becomes difficult. After all, then you will have to do it!