18?! Start planning world conquest!
Building an empire or even a Galactic empire takes time you know?!
Speaking of going out or liking a certain girl well the female species are known to have invisible radar antenna for people who like or have a crush on them. Heck even a spike in adoration(the feeling of 'hey not bad') could turn their head to you who's far and been out of their sight because they sensed you which would kinda be embarrassing especially if another female like her mother turned her head to you too. . If they give you clues and signs in conversation or just 'that' look or a welcoming stare then you're in a good position if not may need to work on it a bit to get her to know you better and vice versa. There's nothing more hurtful than a one way love but when you fell in love don't do it halfway! Yay! LOL.
If it was just a crush then you kiddin me?! March on! Don't worry about the outcome! If you worry about your ego then you're not worthy nor ready for a relationship.