If you've never said one of the above things to yourself (delete the ones you'd never want for yourself), then I'd be very surprised. Here's a simple truism.

You will never achieve anything if you do not even try.

Obvious, isn't it. Of course people do try and they often meet with failure. So you end up with:

I tend to fail at these things, I'd be better off not putting myself through the rejection.

This is not a life slogan. It shouldn't be. In a lot of people's cases, it turns out to be how they end up behaving. Let's be honest, one's dreams are frequently out of reach, and there's no guarantee that you'll succeed if you try. There is a guarantee: you won't succeed if you don't try.

It's not about luck.

There might be lottery odds of you succeeding, but people win lotteries all the time. (Note, this doesn't mean you should enter lotteries, which are totally random and out of your control.)

So, do what it takes to find an entry point for your particular dream and follow it. Make proposals. Make that pitch. People who are successful have had to do it. If you want a success, you have to do it. You have to treat rebuttal as a natural by-product of trying, and you have to keep trying. I'm not a role model of this, but I've done maybe a little more than average of it.

• A few weeks ago I put a pitch for a TV programme to a BBC producer - he said no, and gave good reasons. It was a fun process to pitch.
• I've put book proposals to publishers - no results.
• I've been on stage 1200+ times, some of which required me to ask promoters, nicely, if I could go on at their gigs
• I'm generally successful in job interviews

My TV show won't get made. The next idea might...