Am I infertile?

Sonia • 25 years old, engaged, TTC for 5 months. Been a stressful and a little discouraging experience but I will not give up!
How long have you ladies been trying before you actually concieved?! I'll be 25 in less than 2 weeks. I'm young and healthy, I've been trying for months and months. I'm starting to think I can't have children. Should I be worried???