In every situation they'll get you coming and going ex: taxes, fees, extra fees, charges, and etc etc. Friends in school, work, and life mean nothing. The only true friends you'll ever have are the ones who are around in the end. Even then your perception of what a friend is and should be will never be obtained. It's not your fault for having high expectations its their fault for being shitty friends.
Your image, popularity, and being a part of the in crowd will not serve you well when those things fade away and you are all alone in your final days. The only saving grace if any is to be true to yourself and never ever change who you are for money, friends, to impress people, or to gain things mentioned above.
I'm still learning. Oh one last thing don't be an ass kisser or yes man because it may get you to a higher position or better job but the people you wrong or the bridges you burn getting there in the end isn't worth it.