There is no need to apologize for your success.If you do not feel successful, how can you expect others to believe in you?
There is a fine line between showing off and wanting to make a positive difference in the lives of others. Only you know your purpose. If you are an authentic person, people will see the truth in your word and action.
You do not want to exaggerate, and at the same time, you do not want to play small. The world needs you to shine your light!