You're an introvert if there's a group of people laughing and having fun, and you're not part of that group. You never are.

You always are alone and want to be left so.

People? Ugh!

But, there's a downside to wanting to be left alone and to your devices: introvert problems!

1. They think you are antisocial.

A look at your seemingly gloomy vibe, and you'll automatically be judged. People are that way. Not many try digging deeper, try walking in your shoes. A few feel sorry for you, sitting alone, and might try to talk to you. This annoys you even further, and you just nod your answers with either Hmms and Ahans, which leads to a tenacious infamy.

2. They think you have attitude issues.

When you've successfully scared away the pitying few, you then face misery of a whole new level. People start believing that you have attitude issues, think too highly of yourself to indulge with the mortals around; to pay them any attention. This is the worst. Even the ones you made small-talk with, don't talk to you. And you find yourself, not at a loss, but into the bowels of more frustration.

3. They think you have an inferiority complex. 

What else do people blatantly assume? That you have a bad inferiority complex. They think that you think too lowly of yourself and that you're not important or cool, as the term goes, enough to be included into cliques and groups.

4. They think you're too scared to talk.

Another of people's wild assumptions is that they think you might be very shy and can't participate in face-to-face conversations. Some people avoid conversations because either they have a secret, that might be revealed if they talked too long, or because they have a personality type; not talking to people is pertinent to it. But, some people just don't want to talk. And are misunderstood, instead, as shy and afraid.

5. They think you have a "past."

This has to be the worst of the assumptions. People think that since you're so bad at socializing and acting normal, there has to be some history. Something that "made" you this way, makes you act the way you do. Maybe it is just them trying to understand something that they can't. People are afraid of what their minds can't encompass. In order to not feel this fear, they force explanations to fit you. To get over you, judging you, and to the next human being.

While all an introvert does is "think." See things a not-too-much-thinking person wouldn't. Do things a not-too-much-thinking person wouldn't. That doesn't mean introverts are aliens. Everyone feels comfortable in doing whatever it is they feel comfortable doing. If a person prefers seclusion and less conversation over being loud and seen, why should they be judged?