The reason you cant start yours in gear is probably because you're trying to do it while the bike hasn't been warmed up. Some people may be able to start their bikes in gear when not warmed up, but their bikes are probably just newer. Next time, ride the bike around till the engine is hot, then turn bike off and try to start in gear, it should. If it doesn't then you need to adjust/replace your clutch cable, but the most likely culprit is the clutch basket and hub, they are probably notched and need to either filed or replaced, if the notching is too much.