No one understands what i say

Is it normal that every time I say anything people either don't listen or they seem to not understand what I say. They dont get me for some reason. It's gotten so bad I rarely speak to anyone so I searched out chat forums and stuff but no one there gets me either.

Because of this I am withdrawing more and more from society and people. I am so sick of people misunderstanding everything. I've seen therapists about it but nothing helps.

I know I'm a nice person who means no harm but everyone seems to think I am horrible, yet based on there reactions they didnt even understand what I was trying to say.

I am so frustrated and coming towards my end dealing with this. There is no point any more.