TIFU by lacking confidence

TL;DR at bottom, above the edit note

Obligatory this happened a long time ago and it could have been much worse.

At the time, I was a very shy 9-year-old with ADHD and autism, who had no common sense or social skills whatsoever. I also had low muscle tone, which basically means I was really weak.

So, a lot of the boys at my school were doing this thing where they jumped from the top of a short concrete staircase to the large halfway platform about five steps down. They always looked super confident while doing it and as a nervous, weak, and "uncool" 9yo, I was jealous of their apparent physical abilities.

One day after the bell rang at the end of recess, I decided to give it a go. I start a run-up, and right as I was about to jump down, I thought: "I can't do this, I'll hurt myself". Mid-jump, and I mean right as I was springing off, I tried to stop my jump, failed and only slowed down, and didn't have enough momentum to get to the halfway point. I realise this and start panicking, so I don't think to try to recover and land on the stair before it. I hit the edge of said stair, fall over, and land on my knee, scoring a big graze. The halfway platform is large enough that I don't fall down any further, but the two girls watching me laugh, and then come over to help, because they were nice.

I came out of the whole thing with a grazed knee, a slight humiliation, even less confidence, a large bandage, and a scolding from my parents.

TL;DR: Tried to jump down a staircase, lost confidence halfway through the jump and fell over, getting a large graze on my knee in the process.

EDIT: fixed TLDR to say "TL;DR:" instead of "TL:DR;"