speech to the limit

i think everyone agree that i can't stay calm, talking all the time, bubbly, loud, etc.
i know i do, but you know what? sometimes, my other side just come out but not in the right time.
and what's my other side? my other side is that i can't talk with some spesific people. i can, talk, but there is no topic that i can talk about. so i just talk about the same thing all over again. that's oh-so-boring you know.
not just one person okay? some few people. and i except understanding from you guys, if i'm quite silent, it doesn't always mean i'm mad. sometimes it is just because i've got no topic to say.
please understand. and i'll try to control my emotion so i can stay normal, not too loud and not too quite. thanks before.