Hey shrek,
Glad you had fun with the shrooms, they can be alot of fun but remember that they can also be used to enlighten yourself. You can gain alot of personal insight from halucinogens, so some time if you have the time to spare alone you can try meditating while on mushrooms. Also sensory derpivation is real interesting as well, just find a dark, quiet room and fall into your own mind.
BTW I know exactly what you mean about the two different conversations going on in the car where you felt you weren't a part of either of them. That kind of thing can happen alot when tripping, but just try and ask yourself why is this happening? Am I choosing this or is it being forced upon me? I think most of the time the answer will be that it is your choice and your mindset that alienates you.
Best of luck on tour next voyage.