I think introvert means different things to different people.
Some just don't like to be around people in general, or maybe just crowds, and may make them feel drained.

Some people that I have met say they are introverts, but I think are actually just shy.

I used to call myself introverted because at parties if I didn't know anyone, I would just stand in a corner, so I rarely went anywhere I didn't know at least someone. Even then I would just attach myself to them and not mingle.

However, I love parties and large groups with people I know. It make me feel happy and energized to be around them.

It is kind of funny, as it was a friend that called me on it, and made me realize what was going on. I had put in my Meetup profile that “I wasn’t exactly a social butterfly”. She said, “that is bullshit, you throw awesome parties”!

After she pointed it out, I realized that when I was the one throwing the parties, I was very comfortable being host. I had no problem walking up to people and seeing if they were having fun etc… I think the difference was that when I was at someone else’s party, I didn’t want to intrude on people I didn’t know. However, when I was hosting, it was my job to make people feel comfortable.

A little while after my “epiphany” I decided to try and get over my shyness, so I started hosting/organizing for Meetup Groups. If I was the event organizer, I “had” to be more outgoing. It has helped immensely.

Lots of self-care. And knowing how much I can handle before I have to retreat and recharge.

Coffee.

Before college I was a big introvert. I'm still an introvert, but not as much as before. I think college opened me up a bit, especially a couple of speech classes, and just having a broader experience overall. I tend to stay away from groups. I enjoy my alone time. I'd rather stay in and enjoy a movie or something like that than go out to a bar or lounge most of the time. I have opened up to that stuff though more than ever.

I used to be. Now I oscillate between introvert/extrovert.

For me "coming out of my shell" involved finding groups I had affinities with that met in person. A lot of my "introversion" came from feeling "different" from other people due to my particular fascinations and way of viewing the world. With the advent of the internet it became obvious that I wasn't the only one with the outlooks that I have and it made it easier to find people I could communicate comfortably with. That was a starting point. From there I actively sought to learn how to understand how other people saw the world and made attempt to communicate with this perspective in mind.

I guess the first place to start is to ask oneself why one sees oneself as introverted? Not so much the evidence of the symptom of introversion... but what is the cause?

There are a whole host of reasons I can imagine, drawn from my own internal speculations...

"If a person comes to know me, am I then beholden to be the thing they know?" ... a desire not to be locked-in to a personality is one of the reasons I have.

"I do not know how to relate to others in a fluent way."
As a youth, I spent a lot of time on my own, reading, drawing, and wandering in the hills... I did want to relate to others, but often found myself inept in my interactions. One strategy I developed was quietly exhibiting some creative skill that I had cultivated alone, in a social setting (such as a party)... draw a picture, or fold some origami... eventually someone would walk over to see what I was doing, creating a "safe" way to interact with someone and show them something of myself. I guess it was a kind of "fishing" using my own interests as bait to draw attention to a subject that was relatable for me. I did want to share and sometimes this lead to an "over exuberance" when the flood gates of expression did open. I've learned to temper that somewhat.

Those are just two that spring to mind... but it could be a book.

The phrasing of your question "how do you deal with it" suggests that introversion either creates undesired states in your life... or introversion itself is a thing you would like to surmount. For me, both things were true. For others, I imagine there simply is "no need for others"... and they are not desiring anything to be otherwise... or leastwise they are satisfied to have such minimal needs met through forums such as these.

Introversion due to it's nature can be hard to disrupt if that is your aim. It has a tendency of getting lost in it's own feedback loops. Beliefs you have about yourself don't have an opportunity to be disproven. If Introversion is a thing you want to change... focus on doing "different" things. Just break some habitual behaviors. You don't have to start skydiving or anything... just do something different, take a walk, volunteer somewhere, go see a live band, make it a practice to add variety to your life and see what happens. Choosing activities where you encounter people is good opportunity to examine what exactly is going on with your internal state and dig deeper at it's root. When uncomfortable feelings arise, note what is causing it and why, if you can. Sometimes you just need better company, sometimes it's something else.

I am and I don’t deal with it very well. Lol

Me. I'm outgoing with people I'm comfortable with. I come across as a bitch to those I'm not comfortable with. I have no solution for this!