I don't quite understand the question. If you mean online don't want to play with other people, you should be able to start a Solo session by going into story mode, then selecting Online -> Play GTA Online, then selecting Solo.

That said, to rob bank online, you must have a hideout purchased first. Steal cars and sell at Los Santos Customs until you can afford a basic house. You'll then have a room where you can set up a heist. In story mode it's usually straightforward, just follow the story hint the game gives you.

This post has been edited by RAMChYLD: Mar 5 2020, 05:58 PM