It's your life!
Doing what favours you does not make you selfish, self-centered or proud.
It shows that you are emotionally intelligent and self-aware.
It makes you live your life in full. It makes you take responsibility for your actions without pointing accusing fingers to someone else.
You are (and will be) accountable for what you do with your life.
At first, people will not like what you do but while you continue at it (in doing and in the telling), they'll understand why.
Go ahead and do what favours you. Then take absolute responsibility for your decisions and actions.