Inn that i'm considred as a moron when i'm polite and cardial?

So I try to be polite and kind. Sometimes I feel like people are thinking I'm crazy when I greet them, just say hello, good afternoon and smile.As if they have never heard the word courtsey. It's a paradox that some even could think I'm a lesbian when I'm nice to girls that are just friends or acquaintances. The worst comes when I show my good attitude to my closest people. Even they take advantages of this. When I'm rude and shout, all pay me attention and take into consideration my opinion. Another side of my issue, that I don't want to hurt anyone and do not ask too personal questions, I'm not inquiring, I try not to hurt anyone by asking question they don't want to answer, so I feel I'm also considered as a moron. The same happens when I try to express my feelings. I'm sometimes really too expansive and emotional, cordial or but that's my temper. Should I stay indifferent to all? Is that so weird or I'm just infantile?