Guilt

Religion and Society use Guilt to manipulate you to believe as they do. Guilt is the most powerful motivator--it causes people to avoid eating donuts, it makes you go to bed early, it even makes you beat yourself up when you do something "wrong."

But who determines what is "wrong?"

Realistically we are all individuals and determine right and wrong on our own --I know, that's a very relativist statement. [we think eating donuts are bad because they will make you sick, ie fat ie unhealthy ie shorten your life, but if you think a short life is perfectly acceptable for you then what's so wrong about eating a donut  and being fat and unhealthy? --if you're comfortable with the outcome, it doesn't matter.]
MMmmmm...

The problem is that people aren't comfortable with certain outcomes because of guilt: society makes you think that being fat is bad and they ostracize fat people. Society is obsessed with living forever and finding ways to prolong their lives, so they frown upon people who want to live a short, happy life.

You beat yourself up because you want to fit in with society. You want to prescribe to the same things that everybody else does and you have a subconscious desire to believe what the rest of society believes. You simply want to be a part of the "in" crowd.

You don't have to be.

You are an individual.

My recommendation is to live your life questioning everything. Question why people believe the things they do. Question why people do or don't do things that you clearly want to do. And after you do or don't do those things that people don't want you to do, question whether they really bring you what you want.

Everything you need to understand about life comes back to elementary school jokes: If everyone jumped off a cliff, would you?