I see your a young 14 years old. First, don't bother dating at your age sister. Your too young to even worry about this, let alone date someone. Secondly, you have more important priorities now at your age: school, physical maturity, maturity in general to adulthood and of course, your faith in Christ should mature as well.
2 Corinthians 6:14
Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness?