Since you are talking about your "package", that you must 'tuck in', then I'll presume you are a male. So why you are so concerned with -not looking like pretty ballerina-.....has me a bit confused.
If you would like to study ballet, then there are several sources for tights (mens') and dance belts that should suit you fine. As for getting rid of the lump, to this day, I have never seen a male ballet dancer without his 'lump' protruding, even if only slightly.
However, it is (or at least should be) the dance that is the important thing here. Something tells me you would be a lot more comfortable (at least as far as dancing goes) with the more acceptable garb for men (even with the lump), than with anything that is going to excite you so sexually when you dance that you get a hard-on from it.[/i]