I have, in dire circumstances of course, loaded my film into a tank in a dark room with light leaks---under and around the door, etc. Unless it takes you a half hour to get the roll onto the spool, it shouldn't be that much of an issue. It certainly wouldn't obliterate it like this.
Dark bags are a fussy thing to use on a first try. You should probably avoid using one for now, as it's a frustrating enough process to get the knack for to begin with. It's not hard, it just takes some practice before you can do it smoothly and quickly.
Make sure you keep in mind that while photographic paper, for the most part, is safe to have under a red light, film is sensitive to all wavelengths---you'll need it to be as dark as possible! Practice spooling the film and assembling the tank with your ruined rolls and keep trying! Good luck!