I just started gym 4 days ago and the gym instructor asked me to start my training with gym equipment such as chest press, arm curl etc.

So I started with weight around 30-40 lbs for all equipments. But I wanted to increase the weight but I can't handle weight more than 40 lbs. Whenever I asked people around me about my problem I get answers like " Are u kidding me? 40 lbs above also can't do?"

So I need advices on  how to increase my strength.  Thx and sorry for the bad English.

Chied am slow, took me 8sec to realized that you're talking about Thor