I just read your concern about Kesh and i hope i can help you in some way to make you a stronger Sikh and not take a step backwards from the path to Waheguru :) Many Gursikh boys here in north america face the exact problem. However the pressure also comes other races and religions. From observation, i have seen that they resist this temptation through the support of family, friends and most importantly, Waheguru. I have 2 younger brothers who have never even thought of even cutting their hair, trimming their beard or moustache despite all the ridiclue they get from school and other social places. I believe that this type of harrassment has made them stronger people and i love them for this! You need to immerse yourself with Waheguru more by doing pat, going to gurudwara and doing sewa. Continue showing people your inner qualities(personality) because this is what makes you who you are.
I hope this helps you!
Just more from a personal experience, sadly, when i entered my second year in university i noticed that many of my Gursikh friends had decided to trim their beards/moustache. This upset me a great deal! So please find it in your heart to resist this temptation!