Weed won't Cause you to think something.
However, psychedelics have a tendency to further your introspective abilities.
Either you've been conditioned to feel this way over time,
or you already have low-self esteem and feel ostrasized maybe?
and weed is merely allowing you to become more aware of yourself in a social environment.

The paranoia and inability to relax... well... Sometimes weed isn't for everyone.
Sometimes you need to learn how your own mind works before you can overcome these types of problems.
And sometimes maybe you just need to smoke more indica strains, which produce a more lethargic, calm, less speedy and on edge feeling.


The pasties? (dunno) and breath, well, brush your teeth and drink lots of water.

I smoke by myself to avoid an un-relaxed high, it just isn't worth it for me.
But that does indicate that rather than change my environment, I should change my interpretation, which is the true cause of such feelings.

Everything is within you.
It is up to you to decide how to organize your own world.