Why is getting pregnant so hard for me and I'm young?

See your doctor. It is normal to take awhile. Even up to a year. How long have you been trying. Please see your gynecologist.
Infertility. Infertility occurs in about 15% of couples. The causes vary, but a rule of thumb is, 1/3 are female problems, 1/3 are male problems, and 1/3 are both male and female problems.