Introversion and shyness aren't the same thing. Because many think like that they think they aren’t introvert while they are introvert indeed.
Below you find some signs that you are introvert, although you didn’t thought before you were.
1. You don’t feel comfortable at crowded places.
2. You aren’t excited about meeting new people.
This doesn’t mean making friends is hard for you, but that sometimes you don’t really looking forward to it because of all the energy it cost you.
3. You’re great at speeches, but not great afterwards.
Speeching at a wedding for example isn’t any problem for you but later people coming to you to compliment you about it for example is a totally different story.
4. You’re friends with extroverts.
For the balance for both types of people there are many friendship between extroverts and introverts.
5. You don’t like interviews
6. You’re a loyal friend.
Introverts are very loyal and honest people.
7. You like doing nothing sometimes.
It is a way of relaxing for you.
8. You won't text right away back.
You take your time for texting back.
9. You don’t trust easily.
It takes a bit longer before you trust someone. But that means you really can count on your friends.
10. You write.
Many introverts like writing. Doesn't matter what but you like writing.
11. You’re courteous.
Introverts are more mindful of their surroundings and perceptive to small details.
12. You are a planner.
13. You’ve got an old soul.
Introverts are seen often as mature and wise.
14. You know what you want.
15. You have a balance in your life
Introverts have often a balance in their life of alone time and socializing. This balance helps you to have fun without burning out.