Pedophilia..

[Himalaya Eater]

Yep in most places the age of consent is around 15-18 years so you can kiss and stuff but no s*x (yes I censored it again).

[KurdishFalcon]

On topic: Pedophillia usually regards rape of people under age of consent; this isn't rape and it's consentual. No problemo.

Off topic: Reminds me of an old song...
https://www.youtube.com/watch?v=xxj81deO1Z0

14 is under the age of consent in a lot of places so regardless of consent anything that happens would, legally, be statutory rape.

Age of consent in OP's country (Denmark) is 15, so I guess they should stick to flirting until then.

[Infernaw]

Why would you even want an undeveloped and immature girl when you're 21?
She's still in the journey of finding herself, and getting her curves on. You might think she's "mature" for her age, but trust me, she isn't.
My suggestion is finding someone that's at least 17-18, sorry pal.

[Baskingner]

As a joke between friends we always say as minum age:
(Your age / 2) + 7 = his/her minimum age.
On a more serious note, i think you should take the responsibility here and end it. Its ofcourse entirely up to you.