Hearing "no" sucks, but it's not failure.
Think of it another way:
Every time you successfully make a new contact, treat that as as a step forward.
Most "filmmakers" don't even get this far.
The results may never show up on screen, but each new experience gets you materially closer.
There's a lot of value in "no".
For every no, there is a much better yes somewhere.
We just have to find it.