Edited to Add... this is a GREAT book that can give you some advice! It was published first in 1937 and has helped tons of people, and is still a best seller. Very easy to understand, to the point, great scenarios.
How to Win Friends and Influence People, by Dale Carnagie
http://www.amazon.com/How-Win-Friends-Influence-People/dp...
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Stop trying to change who you are to appease others, it's confusing for you, and confusing for them. Be yourself. You are a great person and your family loves it. If they don't get your jokes at work, then don't joke around all that much. A lot of people just don't get dry humor.
Jobs are a melting pot of different personalty types, and individuals from different backgrounds. Some people are content being the receptionist, some are cutthroat trying to climb to the top of the ladder. So you will never be able to please everyone.
I know my mom has a nervous tick... she giggles, at everything. If she has to ask a waiter for a napkin, she will giggle, it's weird and makes people uncomfortable. She knows that, but that's her nervous tick because she is shy, and so she doesn't stop.
Perhaps you have some sort of nervous tick as well and don't realize it. My friend tick was sticking out her tongue and licking her lips. It was weird and inappropriate a lot of times and turned a lot of people off.
Anyways, whether you do a nervous tick or not, just continue to work hard, to be a concerned individual, polite, and command respect. State your ideas clearly and concisely to your boss, if someone tries to take claim over that idea, just restate, "Yes, how I just explained that, sounds like we are on the same page."
It sounds like you have been trying to fluctuate yourself too hard, from going to reserved to being the office cheerleader, so that won't let people get to know the real you. Perhaps those moments of constant motivation are irritating to people. Sometimes, you have to match people's personality types for a time, not to be like them, but if they are more reserved person, then you save your serious side for when doing business with them.