why do you worry about how the world act?
Jesus said we should depart from this world and live our life holy, because the Kingdom of God and Holy Spirit are not from this world but from him.
that is the way it is and the devil does tempt us. We may feel jealous/envy that these people can go and get drunk, clubbing, go to gigs and festival, go to bar, go to party etc.
In the end they are wandering in darkness and heading to the path of destruction.
You need to depart from them, stay faithful and follow god.
Jesus said pick up your cross and bible and follow him, deny yourself and put him follow even if you have to do it public.
Fight the temptation, if you are with God, you should be happy, why should you feel depress?
do not worry about this world, or the world's concern will worry you.
if you want friends, look for Christian friends instead because Christians worship God, God is love therefore Christian show love to their neighbours.
As you can see, the world do not show you love by the way you dress, and they want you to be like them- dressing like a hoe and with make up.
Get a christian penpal friend, on ChristianPenPal.com or search for Christians on Facebook.