To be honest, there isn't any mainstream alternative to OOP, when it comes to building software professionally because of the very wide use of OOP , because of

To be honest, there isn't any mainstream alternative to OOP, when it comes to building software professionally because of the very wide use of OOP , because of multiple reasons like security (provided by private & protected classes) or data hiding or Abstractions or Encapsulation. If you are having difficulty with OOP & objects, then go through the reference, but do it, there's no better mainstream alternative.