Feeling out of place

Ever feel like you did something stupid and feel like your out of place. I am a strong person and for some reason sometimes I go in the role of a weak person. I try to please others so much that I look weak or people think they can take advantage of me.  Just wondering why I put myself in that role. It's a flaw of mine that I hate. I am strong and usually don't take crap from anyone. But at work at any job I sometimes act this way. I want to be trusted, liked and most of all I want them to think of me when they need someone. I just don't want to be seen as a moron or someone who is not capable of doing things. I guess sometimes I do things wondering why I acted like that or why I said that. I sometimes act like a moron when I am at work. Not all the time. But times when I am put on the spot. I sometimes feel like a kid who would rather stay home in my safe controlled environment than be where I feel like I am on display. Sometimes I feel like I would rather stay home and not feel awkward in the public eye. Not saying I don't like to be in public or near people. I just don't like it when people talk to me as if I am stupid and don't understand things. I sometimes like working alone so I don't have to feel awkward.