Self doubt is about beliefs that have been programmed into our minds that promote limitation and self deprivation. The way to get rid of those is first to practice quietness in order to observe the patterns of your thinking and identify the underlying beliefs. Then you need to choose to change and then consciously re-program your mind with whatever beliefs make the most sense to you.
Would you like to know how I did that for myself in detail, give me a call. Got some minutes leftover.
Looking forward to hearing from you.