Impulsive =_=

• proceeding from natural feeling or impulse without external stimulus; "an impulsive gesture of affection"

• without forethought; "letting him borrow her car was an impulsive act that she immediately regretted"

• driving: having the power of driving or impelling; "a driving personal ambition"; "the driving force was his innate enthusiasm"; "an impulsive force"

• capricious: determined by chance or impulse or whim rather than by necessity or reason; "a capricious refusal"; "authoritarian rulers are frequently capricious"; "the victim of whimsical persecutions"

• hotheaded: characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)

Source from here.

For some things I'd do out of nowhere, sometimes I do regret it.
Could be a tiny regret "oh, whatever, I don't even think people noticed...", quite regretful "awww, noooo..." and "what the hell am I thinking back then???" kinda remorse. X(
I just can't help it, it just happened.
Learning to deal with it isn't as simple as it seems... *sigh*