Learning Curves

This is more of a confidence thing for me and this applies to many things but I don’t understand why people have different learning curves on different things. For example I understand loops and arrays very easily while the idea of constructors and objects seem to have a larger marginal thinking time cost associated. I know most people say to push through and then it will get better but I frustrates me when I feel other people pick it up more quickly when they have trouble picking things I find really easy.