a crippling habit

there's this really crippling habit of mine that i gotta break out of and that's doing the first stupid thing that comes into my head without giving it a second thort... like when i'm writing an email, i don't sit and think for ages, i jus write it as i think it, i don't proof read it if its longer than 3 lines and i jus hit send.. i was writing an email to my group jus now and i made a sarcastic joke abt my supervisor (good ole zakary) and hit send... then realised after it went to him as well.... tht's not gonna b a joke well recieved lol its like my mum once sed to me after i made a silly suggestion then tried to retract it, she sed "yes but the problem with u is that u actually go and do these ideas u get"... i don't know y i dig mself those holes and i don't know y ill do it agen