if nobody takes you seriously, does that bother you? what did you do to make others take you more seriously?

hello. I know simply asking this question would stir some people to contempt me, but, this is something that has been bothering me for so long time and I just wanted to know if there is other people who has similar issue and what he/she did to overcome it and made others to take them more seriously.  

Simply put, I'm one of those unfortunate people who seem to many others (especially those strong aggressive alpha type) as someone they can walk all over. I'm just 5'9" with 155 Ibs without much muscle who look rather meek, quiet, passive. I get offended and hurt on daily basis. Sadly, I'm the type of people if you want to cut line and look for who to stand in front of, you would choose me. Sometime I get those nasty attitude, or one of those cold condescending tone of voice from not-so-nice store clerk or waitress (i'm sure they would treat some 6 feet intimidating looking person with respect and nice submissive tone of voice). If I say something not so clear, I'm the type who often get one of those condescending "what?" or "what'zat" rather than "i'm sorry?" or "what did you want again?". 

To people who get similar treatment, does it bother you? Or am I just overly sensitive? what did you do to make others take you more seriously with more respect? did you change how you dress (maybe started dressing more intimidating), did you start body building? did you stop smiling when talking to stranger? what worked for you to make others take you more seriously? thanks.