Tips on starting?

23f, i’m starting my first class this week and im excited but anxious to start. i’ve always wanted to do it before but held back by my own thoughts but i’m finally biting the bullet and found a gym. i’m just really nervous about starting because i can’t even do a push up out of shape type situation, overweight, terrible with cardio and scared of being behind everyone else. trying to see if anyone started in the same spot and overcame it as well as any tips for my first class.