Do what your inner voice tells you...Be different and true to yourself...and when you do make mistakes (Hopefully they will be minor ones & not dangerous) and you will being young make mistakes that you learn from, pray that you have a bunch of angels watching over you.
It is true your choices of friends & associations will make a big difference.
Don't do anything that is life long damaging like experimenting with drugs that are addiction possible.
Don't do something sexual with out precautions & protection.
Just be smart enough not to do something that will alter the course of your life permanetly & negatively.
Know that peer presure is a fleeting moment in your life, where as what you might or might not do could be a forever thing in your life.
Watch out for selfish and evil people.
I wish you great luck in your adventure in life.