I think my mom and my dad have told me that I'm slightly obsessed with nerds
Why do you think they think you like nerds?
I'm a very logical person and an attractive nerd is the only logical choice.
Your parents are great at noticing, and they are very caring parents. It's okay to have preferences, but it's not okay to fetishize and only think of liking nerds only.
Yeah well I'll do it anyway.
Limiting your romantic choices to only a few select people is a recipe for frustration. What happens when nerdy people don't like you back and then you get stuck in your narrow preferences.