'The world is an unhealthy environment' is just an excuse. We can't escape living in this world, but we do have the ability to choose what types of environments we go to. There is a huge difference between our existence here on earth and going purposefully into a place where sin is celebrated and encouraged.
And no temptation? Really? Anytime you go to a place where everyone is doing the same things there is temptation to fall into it. Period. And the bible says to flee temptation.
And 'i'm seeking my happiness'. That's the whole point... your happiness, not doing what is right.
How will this affect your witness? Someone knows you're a Christian and they see you at these things with sex, drugs and alcohol, what will they think?
You said it yourself, this is about your happiness. That is your priority. That's why you make excuses like since the world is an unhealthy environment i may as well go and support and place myself into temptations way, in ways you don't need to.