in parts of uk it was the same when i was growing up.
i got actually bullied at school for seriously believing in God (u were supposed to stop believing when u realised there was no 'father Christmas' literally coming down yr chimney. the 2 beliefs were considered basically the same).
i was protestant at the time (there were no orthodox Christians anywhere in the area), and some kids were dragged to church by their parents, but no-one else in my class seriously believed.
so can i please encourage u to make the step of mentioning it casually in conversation and then accepting the shame people will give u.
it is truly a blessing to suffer for the faith, it makes yr own faith deeper and more meaningful.
one of today's readings from my church may help:http://www.copticchurch.net/classes/getLectionary.php
James, a bondservant of God and of the Lord Jesus Christ,
To the twelve tribes which are scattered abroad:
My brethren, count it all joy when you fall into various trials, knowing that the testing of your faith produces patience. But let patience have its perfect work, that you may be perfect and complete, lacking nothing. If any of you lacks wisdom, let him ask of God, who gives to all liberally and without reproach, and it will be given to him. But let him ask in faith, with no doubting, for he who doubts is like a wave of the sea driven and tossed by the wind. For let not that man suppose that he will receive anything from the Lord; he is a double-minded man, unstable in all his ways.
Let the lowly brother glory in his exaltation, but the rich in his humiliation, because as a flower of the field he will pass away. For no sooner has the sun risen with a burning heat than it withers the grass; its flower falls, and its beautiful appearance perishes. So the rich man also will fade away in his pursuits.
Blessed is the man who endures temptation; for when he has been approved, he will receive the crown of life which the Lord has promised to those who love Him.
note that is says : 'testing produces patience' and 'let patience have it's perfect work',
so accepting the scorn of yr mates and then loving them in return and praying and waiting for God to change u actually helps yr spiritual life, gives u joy and makes u more like Jesus.
i know it's hard (it certainly didn't make me any friends at school!) but the more u accept this, the easier it will be to keep admitting yr faith to yr faith to yr friends.
u may even loose some friends, but God knows yr needs more than u do and will supply everything u lack.