I don’t agree with the notion that you have to believe in yourself before anyone will believe in you. Sometimes it takes someone else to believe in you before you can actually believe it enough for everyone else to believe in you.
If you’re having trouble believing it’s possible to live out that dream, keep doing it. Someone will come along and give you that extra spark you need, and it’s a wrap from there.
Just keep doing it, whether you believe it yet or not.