I just find squats hard. Is it something in my technique, or am I just weak?
I have my heels raised slightly using some plates because I feel I lack ankle mobility to get past parallel otherwise. This was also my last set, so my quads were burning here already. I maybe just don’t squat enough (+/- once a week and sometimes I do skip a few weeks) to actually improve.
I find squats quite scary, mostly because I seem to lack stability (see rep nr 2 - the raised heels already helped a lot with this, but obviously not 100% there).
You look like you’re in a decent spot. My main note is that you just look like your reps are ever so slightly lacking in control, in other words you just seem like you’re rushing.
If I were you, I’d drop the weight even to an empty bar for a session or two. Look up how to properly brace your trunk (an excellent video on dialing in an Olympic style high bar squat here ), and then just focus on control and consistency. Slowly descend, pause for a beat, then bring it up explosively, with control and bracing being maintained throughout. Once you feel like you’re really consistent, start adding weight slowly.
Also, there is such a thing as too deep, even in a High bar “Olympic style” squat. Depending on your femur length, pelvic geometry and a few other factors, your ideal squat might be just barely at or below parallel, and that can be perfectly fine.
Also, experiment with foot width and angle to take a bit of strain off your inner thigh (adductors) as you mention they get sore. You also mention that you worry about ankle mobility, the channel that posted the video I linked above has a fantastic video on improving ankle and hip mobility, both of which will help in the squat.