I was a stupid teen. So were you. When did we forget?

You're confusing liberals with leftists.

Libertarians are supposed to be for Liberty (there are people who claim to be these who aren't actually what they say they are). (look to people like Sargon of Akkad, he is against everything the left espouses, yet he is a liberal.) I would consider myself a Liberal, not a leftist. I see everyone as equal, and I disagree with most things the left says. (gun restrictions is something I actually agree with, mainly because my home country of Australia did it and there have been no school shootings since.) Libertarians are supposed to be for individualism, not collectivism (Each person is unique, not that each person has to associate with a group based on skin color or gender). As long as you don't bother me, I won't bother you.

Leftists are for the BS SJW stuff. They are for communism and social engineering (engineering society to be what they want, not what's best for everyone). They are not for the good of humanity. They are not for individualism, and they are not for Freedom.

Actually, as used in the US, libertarian is not the same as liberal. Liberal = leftist. Your description of leftists is spot on though.

Well... you can't argue with the latter part (because it's true)...
...But I will still argue the former, mainly because in other parts of the world (Britain/Australia mainly) it means what I have stated above. I stand true to what I have said.

I recommend reading this: https://en.wikipedia.org/wiki/Political_spectrum .
It's good background knowledge for political debates like these.

I hate to break it to you, but nobody in the US is going to change the definition of liberal to whatever it is in Australia. Hell, we still don't use the metric system. Your original post complained that people are confusing leftist with liberal. They are not. The terminology is different in different countries.
On the off chance that wikipedia had something intelligent to say re politics, I took a look at the article you posted. They actually make the same point about terms in different countries. The article is also very one dimensional. I would recommend a deep dive into the theory behind capitalism and the US constitution as well as one into Marxism. These are the core systems around which progressivism, socialism, communism, etc. revolve. The basic argument is an authoritarian system vs. a free system. Everything else flows from that.

Well the adults haven't come up with a solution for dead kids in schools, the only proposals are to pour more fuel on the fire and flood schools with guns. You would think after countless mass shootings at schools and universities in the last 30 years the adults in government would have been able to protect citizens and done something meaningful but no....Might as well leave it up to the teenagers now, especially those that saw the blood splattered walls in their schools and went to the funerals of their friends.

Great! What's your solution?