Mine has been the other way around, I used to have extremely low self esteem and feel I wouldn't be able to achieve everything, or make any friends (and I had very few friends in my childhood, and I remember in year 7 I would go to the teacher's classroom before the lesson and talk to the teacher instead of going with anyone else) and now I realise the true talents that I do have and have gained confidence, even if the underlying lack of self esteem does occasionally resurface.