How To Be A Good Person

I have a really hard time not saying what's on my mind. My struggle is saying what I truly mean. I tend to be forceful, erratic and loud, yet in the inside I'm soft as mush. No one sees me like this. Although I don't consider myself a "good person", I know I'm not a bad one. I've pondered many times, why I behave so harshly around others, when in reality I just want to be their friend. I have come to the conclusion that in order to be a good person, one must learn to be silent when needed. We have an amazing gift of being allowed to express ourselves, but just because we can, we don't have to do it all the time. So, here it is, for all that it is worth, I shall try to learn when to keep quiet.