Using this trick involves changing your internet connection settings on your playstation. Please be careful so you don't screw up. If something goes wrong anyway it's on your own risk alright?

Here we go, these are the steps u will have to follow carefully. First go to Gta storymode.

1. Go to your playstation settings.
2. Go to network.
3. Select: set up internet connection
4. Select whatever you are using for ur playstation. (Wifi or cable)
5. Select:Custom (how u want setup internet connection) 6: Select: Automatic (ip address settings)
6. Select: Do Not Specify (dhcp host name)
7. Select: Automatic (dns settings)
8. Select: manual (MTU settings)
9. Write down the number you can see right now. VERY important becouse you will have to change it back to how it was.
10. Select MTU and change the number to 800. Than select next.
11. Select: Do Not Use (proxy server)

Now start gta online like you always do. You will notice you are all by yourself as long as you want. No other players will be able to join you. Perfect time to pick up some packages if u cant find any friendly sessions at the time.

With this internet setting you will not be able to join other players in the session. No party, no setups and other missions. If you want to join other players again you have to follow all the steps again. And change the MTU to the number you wrote down. (hopefully)

Don't get lonely :)