Will I become a bad person in a year?

Hi, so I’m a senior who was born in 2008. I’m currently dating a girl born in late 2010 who skipped a grade and is therefore a sophomore. In a year, I will be 18 and she will be 15, but later 16. Will this make me a bad person? I love her very much and want to be the best girlfriend I can be but I wonder sometimes.