Sooner or later I will have to cooperate with one or more people for a project, it's something common in this, isn't it?
No.
But if you can't program, you have the short end of the stick. It is easier to comission assets or find free ones.
There is a reason why most games use an existing engine and basically design their "level" on that engine. That is not only a lot easier, it saves on need for programming knowledge. You only need to learn how to operate the engine for the basic stuff. For story telling that is only superficial programming. Implementing actual logic, even something like creating a tetris clone, that would be lot's more demanding on programmin skills.
To elaborate my no, most games I saw on itch are single person made. If I see groups, it is basically a small company already.