Dude,i think u can learn bollywood style dance from youtube tutorial videos...Becoz their are so many bollywood dance videos..which helps u to practise u'r dance steps... Just a random thought of mine.. .may be help u..
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if u can't go to dance classes then learn dance by seeing dance videos. And the show nach le ve with saroj khan was really great. u can search for its episodes on youtube and learn dance. About ur parents just make them understand that ur happiness is in learning dance then they won't deny u from learning dance. Or may be they r worried about ur studies show them that u won't neglect studies because of dance and everything will be alright! Don't take so tension. ok, take care. bye!
try youtube... u can find lots of dance tutorials on there...also just look at bollywood videos and copy the dances from there... i think that's the easiest way to learn :)