I'm planning to start driving in the HOV lane solo.
Why are you doing this, do you not know it is illegal to drive in an HOV lane if you're not the intended car to do so?
I have been doing it since I was 15 years old...
You have been doing it doesn't mean it's right and legal. You have just gotten lucky so far because you shouldn't drive solo using the HOV lane. It's illegal to do it and cops have the right to pull you over for doing it.
Fuck. I better stop doing this as it's a serious crime.
I am glad you realized how much in trouble you would be if you continue to do drive in the HOV lane, and hopefully you would also follow other traffic rules in the future as it is very important that you do so for your own safety and the safety of other drivers near you.