I feel like I can’t have kids

My boyfriend and I been trying to get pregnant for 2 months now and I’m worried that something may be wrong with us. But my period is also irregular, I have a 25 day circle so maybe it’s wrong timing ? ...... I just need advice cause im feeling really down about my body and overthinking if I can even have kids. And I’m only 20 years old so I don’t think I should be having a tough time with this?