emarie, some late thoughts:
Hundreds of years ago, Christian leaders saw that dancing was associated with immorality, whether it was folk dancing or performance dancing. So they concluded that dancing was sinful and told their churches not to dance.
The people behind this view were sincere and well-meaning - they wanted Christians to live holy lives - but they made a big mistake. They based their view on the worst that the world has to offer, rather than the Bible.
However, the belief that dancing is sinful became part of the Christian culture, one of the things that define Christians. Whilst it's far less common today, there are still plenty of people who feel this way. And if it's something your parents believed, and you've been taught it from childhood and in your church, it will be a belief that you hold strongly, without necessarily understanding why you believe it.
Yes, there are questionable forms of dance that I do think Christians should avoid. But rather than focus on condemning them, I want to say that there are many styles of dancing that are not all about sex and lust. Let's light a candle, not curse the darkness.
Ultimately, the Bible is our authority, and I'd always encourage people to study what it says about dance. I believe it is clear - God's people are to be a dancing people, dancing for joy and in worship.
I hope this helps.