That pit in your stomach isn't lying to you...
We all make choices each and every day. Some good. Some bad. And we all have to live with the consequences of those actions. But, it is a lot easier to live with those consequences if you know in your heart that you feel you were "right".
If you get that pit in your stomach, STOP what you are doing...
That "pit" is a sign that what you are doing doesn't feel right to you. It's your subconscious's way of telling you that you don't agree with what you are doing. Whether you are at a party or thinking about joining an organization. If you walk into the room and get that "pit" in your stomach, leave. You may think that being there will benefit you but it won't. Don't make yourself feel uncomfortable just to be "cool". It's not worth it.
We all have that 6th sense for a reason. And that reason is to keep us safe and away from situations that will end up hurting us. It's not worth it. Nothing is worth your time or energy unless you in your heart feel right about what you are doing. It will hurt so much more if you take part in something that you don't believe than if you have to walk away from something that you thought was going to be the end all be all.
Trust me... I've been there... We all have...