Do I have a chance with this girl?

I know this girl who I really like at school. Im 18 and she is 15, I know it’s a little bit of a gap, but im a strong beliver that age should not be a boundry. I talk to her in school, but thats it. She jokes with me saying that she “stalks” me and she reacently “liked” on of my facebook pics, thats somethin rite?!

Should I ask her out?