no, its never wrong to hide that your sexuality, unless your totally gay/lesbian and you lead someone on of the opposite sex. you should only tell people when you are ready, good luck with everything.
http://answers.yahoo.com/question/index;_ylt=AqPGbc55PvqvKsRSsMn7ro7sy6IX;_ylv=3?qid=20110513190130AANSsvM
http://answers.yahoo.com/question/index;_ylt=AqPGbc55PvqvKsRSsMn7ro7sy6IX;_ylv=3?qid=20110513190130AANSsvM