Insecurity...?

The other night I did a double-feature of Lovecrtaftian horror on Shudder. I watched The Void (which was awesome) and Housewife (which only got awesome in the last 10 minutes or so).

At any rate, I became inspired, while watching these two flicks, to write a Lovecraftian tale myself.
However, my first instinct was to write it as a screenplay.
And I started thinking,
"Why is your first impulse to picture this idea, this story, as a screenplay? Why not a short story? Why not a novel?"
At first I was inclined to believe (as I so often fear) that, because I haven't written a novel in so long (not since Urban Prairie, which took me from 2011-13 to complete) that I have become rusty at writing poetic prose, attribution, organic characterization, etc. 
Am I too scared to attempt a novel after nearly a decade?
Or is it that I know a screenplay is easier to sell (and will certainly make me more money and give me a career faster if I do manage to sell it)?
Or is that I've had luck with Hollywood offering me whispers of interest for my scripts, whereas I've had hardly any luck submitting my novels and securing any kind of representation or publication in that field?
See, it all comes down to insecurity.
A screenplay is easier to write (take less time as well) and is an easier sell.
A novel (even a novella) takes a lot out of you (it does for me, at least) emotionally, physically, mentally and creatively. It is sapping.

At any rate, I have so many other scripts I need to write, some I still need to outline, etc.
And this script will probably be very experimental: it won't follow the three-act strcuture and will most likely be under 60 pages.
I already have a lot of the visuals planned out. I'm really excited by this idea. It's a simple story, but I hope my rendering of it will be worthy of the adjective Lovecraftian.

Although, here it is nearly mid-June and I've been on summer break nearly a month and haven't done any writing.
I sometimes become horreibly frightened when I think about all the novels, short stories and screenplays I have planned that I may never gert a chance to write.
I mean, as of March 19th of this year I am now 40. Middled-age. My life is officially half over.
Where did the first half go?
Don't get me wrong, I can't complain about my output for the first half of my life: 6 novels, 16 screenplays, hundreds of poems and a nice little dossier of short stories (some of which actually saw publication... digitally, mostly and one in actual print).

But I have my writing list all made up and current.
I have all this writing in a folder on my desktop.
All I have to do now is block out the time and actually sit down to write.
And since I've acquired so many new routines (blueberry Red Bull, my T-shirts dedicated to various writers and writer/directors, burning my Paddywax library candles, etc.), I'll have to indulge these traditions as I sit down to write.
No matter what, I need to start producing something soon, or I'll feel as if my summer has been wasted.