Is it time to visit my doctor?

Hi girls (& guys!!) me and my OH have been TTC for a year now - we live in the UK , I'm 19 and I'm wondering is it it to book a visit with my GP or is he going to turn around and say wait? I just don't want to feel a fool! I just feel like I should be at the peak of my fertility but w it's just not working for us and I feel like something's wrong with me - when is the right time to go to my Gp :( feeling very deflated and fed up :( xxxx