If someone does not believe in you, that may be more of a reflection of them than of you.
It may be their fears, their insecurities, and their limitations they see in you, not yours.
Do not let anyone tell you that your goals are too lofty, that your ideas are too crazy, or that you do not have what it takes to achieve success in whatever way you define that for yourself.
Explore your ideas, play with them, and experiment with their application to find out what works, what doesn’t, and where you need to adjust in order to be successful.
If something does not work, you can always have a new idea.
Is you do nothing, however, nothing will work out.
Do not allow another person’s doubts become your regrets.