It's very stupid and immature in my opinion, not something you would like to live by. 

Basically, hate on others because you hate yourself. But as I said, very stupid and not true at all. Must have been written by a bitter person.

2. How the world sees you, this is unnecessary to explain I believe. Certain standards rule the society and you're torn between your dreams and the pressure to fit into society. Someone above mentioned getting out of your comfort zone, I suggest the same but socially. When you talk to people, no matter if friends or you just met them, be your real self. Don't pretend anything to impress them, and openly speak your mind without inhibitions. Because everyone's trying to fit these standards no one is real anymore, and if they encounter you being yourself, they will be ready to drop their masks as well, this is the ultimate key to strong friendships.

In short, it's your life, you alone decide about it and there's no time limit to make the decision. First become the person you want to be, whether it's improving your confidence or being more fit or whatever. Once you're contend with yourself, think what you truly want to do/have and how can it be used to better the world. Cheers.

There is no meaning of life, no universal answer. You are given your life, whether you want it or not, to make it meaningful yourself. It is necessary to know that you should block out external influences when deciding on your meaning. There are 2 perspectives, and you need to erase both of them to make the decision about the meaning of your life: 1. How you see the world, 2. How the world sees you.

1. You mentioned travelling and having adventures. Don't do anything reckless like those "i have no money but travelled the whole world" people on the internet, in most cases they had money. Travelling is a good hobby, but make sure you can afford it, else you'll end up with more problems. The world will often give you a fake picture of it, to make itself look better and make you look worse. Hence, forget about how you see the world, think about your honest wishes. Wishing "I want to travel and have fun" is rather selfish. If that's the meaning of your life then you wasted it. Always think about what you can do to improve this world, what will be left behind when you're gone.

Both, in my opinion. I do believe wisdom can be inborn as an aspect of each individual's personality. Personality isn't something only humans have, you see it throughout several species as well (e.g. cats - kittens from the same mother will display different personalities: playful, grumpy, scaredy etc.). The brain structure is defined by each one's genes and I ultimately believe that this affects the ability to process information and thoughts. If this is coupled with a high sense for curiosity and awarness of oneself and the surroundings, those people will end up being wise naturally.

On the other hand, I do believe wisdom can be attained as well but requires a lot of experience and learning. Though as it's something learned, I don't think it can ever reach the levels of "inborn" wisdom.

Could help you as well. I'm not native but my English is good. :)