A guide for life? thought one already exists, this one looks more entertaining tho 
but it’s sad anyways, people should try to live by themselves instead of being guided by manuals.
If something doesn’t work, you must be doing it wrong. But don’t try to change drastically, the very opposite actually, be yourself and have some confidence, for you should be the one in control, not any ****'s pet.
In life, I have learned that people always reflect the way you look onto your personality. So if you look like someone they can make fun of, they will think that you are a pussy until you prove them wrong.
I used to be much more overweight than I am now, and it mostly was “punch the fatass” (but I was different inside to what they thought I am) and once they learned not to mess up with me, no one called nor acted in such way towards me ever again… actually I’ve become quite popular, until… well, that’s unrelated 