“If you hear a voice within you say ‘you cannot paint,’ then by all means paint, and that voice will be silenced.”
Vincent Van Gogh (1853 – 1890)
This is not restricted to painting.
It applies to many things.
Decide your goal (Should be on your purpose line. Tips on how to find your purpose are provided here: https://www.tomgrimshaw.com/tomsblog/?p=37862)
Work out how best to achieve it
Learn to ignore the naysayers in your environment and that voice in your head.