Player starts mining (or punching) immediately after loading world

This happens sometimes most of time it just random but when I log in my character starts hitting which i don't left click but it can get annoying because if you're next to your bed and have a diamond axe your end up having walls, picture, frames, with in 5s. i did my best to check before posting to see if anyone else already posted but i'm part new to this site but i did try to look around first.