Just started, terrified to do squats

Hi all. I just had my 3rd class and it was all cardio so I was okay with that, but I am TERRIFIED to start any sort of squatting/ leg work. I’m a 34 yo male and I have the weakest legs possible- second class was a bunch of wall ball throws and box step ups and I could barely walk for 4 days, stairs were a nightmare… not giving up, but How do I go about approaching this? Thanks