I'm not really a "beginner rider" and yet I've lowsided my bike practicing drills in a parking lot. Happens to the best of us
Luckily the bike I had at the time wasn't my 300 and it had minimal plastics so there was very little damage but yea, ego was damaged nonetheless so I get it. Keep practicing though! That low speed control is what separates good riders from bad ones.
But also, you have to make yourself ok with the idea of your bike going down. Sadly, it'll probably happen again if you continue riding and the damage might be worse next time but life goes on and bikes get fixed! As long as you walk away unharmed, all is a-ok
