People trying to fight you, not knowing your a Boxer

Being a 61.5kg light welteweight, clothed I look like I have the build of your average scrawny 18 year old. Unclothed its a different story, but when the odd a$$hole decides to pick on me for whatever reason, because the a$$hole has absolutely no idea im a boxer, I really need a solid line or sentence I can drop to let them know im a fighter and f*cking with me would not be a good idea, whilst trying not to sound arrogant.

So far ive planned to say something along the lines of "listen, I fight 3 times a week, you fight a maximum of twice a year"

Some people who know me and the fact I can fight, genuinely would not fight me as they told me themselves. Obviously to a stranger im anybody, and it would not surprise me if people would still try get in my face and fight even if they found out I was a boxer, because some people are ignorant to the difference in fighting ability between themselves and a trained fighter. I dont like confrontation, but I love the respect I get nowdays for being a trained fighter and it does annoy me when people are stupid enough to judge me on my 5'9 and 61.5kg build and assume im easy meat, what should I say to warn people who are pushing to fight me without sounding ****y?

 

not at all, by no means am I "small" but I could be perceived as an easy target because im not huge, nor am I loud and juiced up.

 

No, I know I dont have superpowers. But im a prideful person who is big on respect, when you have spent the majority of life being victimized for the way you look or are perceived, you grow sick of being underestimated and direspected. We live in a society where men will mindlessly pick fights or bully people they know nothing about in order to establish their alpha-dominance, if you are constantly targeted because you are the book being judged by its cover, you end up wanting to teach a few people some lessons, or in this case for me, wanting to educate them and fix their ignorance.

So rather than being the arrogant and loud bully I so easily could be, id rather tactfully inform them of what they are getting in to when trying to pick a fight with me. I dont doubt a lot of boxers get beat up by average joe's, they are probably the ones who overcompensate for their poor boxing skills with a loud mouth. Judging my ability is not the question being posed here, nor is it neccessary to answer anyway because you just need to assume im fully capable of handling myself in most physical altercations, thats what I ask you to assume.

Maybe I should have worded some parts better, im not looking for a cheesy movie line, im looking for something I can say to avoid a confrontation escalating to a actual fight, the fact im a fighter is the most obvious thing to use to my advantage when warning somebody off because it genuinely makes some people think twice, I used my friends as examples considering the fact they told me they would not fight me, im not going to come up with a cheesy line, or be as blunt as "you dont want to do this, im a boxer" because thats just stupid.

I dont claim to be "dangerous" just not the easy target people I assume I am, I do have the ability to hurt people and im sure that is something most people and I would like to avoid.

And you surely dont believe you can walk away from all fights? that is simply not the case.