Are Our Insecurities Our Own?

In secondary school, I was never a big fan of school sports to the point I almost never participated which led to lots of detentions and punishments. In my mind these beat having to beat in a competition for two hours.
These detentions were always lead by teachers and on this specific day the head of school sport was present to speak to and encourage the students to get involved in sports more.
After giving a short speech, he began to list a few reasons why people may not wish to participate in school sport listing reasons such as weight, equipment, and the one that stuck with me, knobbly knees.
WHAT!!!
To that day I had never looked at my knees as insecurity, I didn’t even realise I had these knobbly knees, but I left that room embarrassed to wear shorts for YEARS due to these knees!
Now I’m not alone with this kind of experience,
While on my daily grind through youtube I stumbled across a video on a channel called Chewjitsu.
In this video, a man discusses an event in which a family member made a comment about his weight which leads to deep insecurities which persisted through the years even as he got into excellent shape and participated in lots of sports.
It was both concerning and calming to find this video as it did two things
1. Justified my weird insecurities as a child
2. Helped to encourage others that these insecurities do NOT belong to you!
With these two experiences, I’ve been thinking about whether these insecurities belong to us, or are they another person’s insecurities forced onto us?
If nobody had commented on my knees, would I have been insecure about them?
If nobody had mentioned Chewjitsu’s weight, would he have been insecure about it?
If you are interested in this topic, I have made a video about it and would LOVE it if you could leave some support and feedback on it.
The mentioned Chewjitsu video can be found here;
