did you try setting your rank to 1000 + right after meeting Lamar at the airport? If you do that it should put you in glitched out state once you meet the at the first race then just go to character selection from pause menu and select the character you just created. You should end up in a public lobby like normal instead of going through the online tutorial.
Some menus have a "Skip Tutorial" option. You'd have to look up a tutorial because there's a certain way to do it.
When I get on my pc again I may make that option in my menu I haven't really coded much for public use as every time I make one ppl abuse the menu