Kratom does not depress breathing, which is how other opiates cause overdoses, so you aren't going to overdose in a dangerous way. However it is easy to dose too much and experience unpleasant side effects. Kratom has a ceiling effect, where dosing more beyond a certain point does not increase the positive effects and instead makes you feel dizzy and nauseous and even sometimes overstimulated.
You are about to feel that, pretty much guaranteed. Why would you make a thread wondering if you'll overdose and then take a shit ton of it before anyone really answered you?