opsec is a constant battle. You are using the VPN, but you have to ensure that you have

1) no other traffic going over that VPN at the same time, so the IP can't be linked to you at that time

2) ensure all your porn traffic goes over the VPN, and never accidentality over your actual IP, keeping an eye on things like dns leaking

You have to be lucky every time, they have to be lucky once.

It certainly won't hurt mask your online presence, but it's not the end of the story, or even the end of the beginning