Ditto.
I'm sure most kids and people in late teens feel the same way, including me. My friends think, to quote: "Wow. This is awesome! I'm impressed! Oh my God! Are all those Jedis?!" (), it's great. However, this probably won't be the same for those in school who feel they are too cool to have a different hobby to usual at that particular age. But who cares what those stuck-ups think? If they are brought up to respect people, it is no problem for you or them. So don't feel it is your fault, it's theirs! A true friend or classmate will be happy for you and admire it instead of teasing you and putting you down.
I'm having a LEGO room soon too, once it has been cleared out and decorated. So if I want to hide anything when people come round it'll go up there.
I wish they would make LEGO stores and the bags not so obvious. In the MK shopping centre the store is surrounded by clothes and music shops, so you get noticed. I tend to get a bag from another clothes shop and put the LEGO bag in that. Then people think you like the latest fashion etc.