Skateboard.....help!!?

75 kg is about 165 pounds, so that makes me 84kg or 185 pounds, basically I doubt you're to heavy because I hardly break boards. Breaking a skatebaord can be many things, bad or cheap deck, not landing right all are some aspects of it, you can simply break a deck by doing an ollie wrong if you landed to hard. When you look for a board look for a size and ply that'll fit you. A 7 ply is your basic ply for a deck some are more, like 8 or 9 plys, these are the layers of veneer used to make a deck the more layers the stronger it is but that can also make it heavier. If you're going to check out decks look into a resin 7 deck, almost, blind, enjoi, darkstar all make resin 7 decks. It's a stronger resin that not only keep the deck strong but also light, they make resin 8's also, or you can look into some better made decks like zero, blind, chocolate, enjoi, plan b all make good average decks that are still light and strong. Work on landing over the trucks or at least close to them and you'll save your board a lot of stress.