SAb ton pehlan waheguru ji ka khalsa waheguru ji ki fateh..
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-youth/31953-peer-pressure-western-traits-and-relationships.html
My dear friend i am not an expert in sikhi but yes i know one very basic thing that gurus made "amrit da Bata" so that inequality can be abolished but still dear this society is not ready to accept this truth even i am a Jatt and my parents have already told me not to fall in love with someone outcaste because this will hamper their image in society..My parents are very religious and i respect them for what they have taught me till today and will always learn from them. But even i accept it that this society doesn't understand the meaning of what our guru's said, why Common kitchen(langar) was started,and man as a social animal work according to society..so that is the reason my dear friend why ur parents still want you to marry a jatt sikh girl only..
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=31953
and about goras my dear friend all you have to do is tell them to respect your decisions don't tell them you won't drink because its in your religion tell them you don't drink because you don't believe in drinking and its your own law you created for you..so tell them to respect you..n don't try to teach them,actually they won't listen to you so just join them but follow what your heart says..what you believe...if you belive in sikhi just follow it no need to argue with anyone..bro.