Paint.net, unfortunately, is a Windows-only software. For Linux, I’d recommend something like Lazpaint. It’s pretty close feature-wise, and I believe that it supports plugins.

atm, if you’re using Waydroid, you can use Aurora Store/ Droid. No shady websites needed!

I’d say yes, as this is what i’m currently experiencing (by comparing myself to others). I’d agree with @agamemnonymous@sh.itjust.works’s stance. If you’re not trying to improve and just bashing yourself, you will go down a spiral of misery. I feel like the self-improvement part requires some balance though. You can use this comparison as a source of intrinsic motivation, but you need to keep it from becoming too much to where you become demotivated, keep telling yourself that it is possible, that you can do this.

I’d agree that blender is very good. I find that it would be more suited to static stuff and renderings, as well as animations. FreeCAD is more like the commercial CAD software you’d find (Fusion 360, Solidworks).

On the topic of blender, It has some amazing features, and I am amazed at what people do with it (I also find it a bit tricky, but I probably just need to put a few more hours into learning)

If you mean CAD, I found that FreeCAD works nicely as a parametric 3D modeler with some nice macros and addons, with the perk of also running on Linux

E: added info