Venting

I been taking my son to this group twice a week. There’s a gross motor room which he don’t like but he really likes the fine motor room. He gets really mad in the gross motor room like he will throw tantrums and his entire body around on the floor this is going on for at least 40 mins he’s so mad. He does get thru the course but like I said he’s pissed off. He’s 22 months old. The way he’s acting which is normal for his age but it’s really taken a toll on me when we go. Today I almost didn’t go because he was already tired before we even left. We went and it was rough. It’s like the more we go the days get harder and harder because today he started hitting the teacher! Idk. I’m not sure if I should stop taking him or what but everyone keeps telling me it will get better. I’m trying my best to do what I can with him. I have mixed feelings about it because I always went to him when he cried right away his whole life now here he will be 2 years old soon. How do I step back a bit? He looks to me for comfort and to be picked up but at school we don’t do it. I’m just so confused on what I should even do.