Worried?

So basically, my mum and dad struggled to have me, they were trying for 11 years before I finally came along. All I want is a family of my own and we really want a baby. I'm worried that I will also struggle to convieve like my parents. I've been having unprotected sex for about a year at every time of the month not ttc and it has been with 3 different guys (don't judge me, I was with then at the time - not at the same time lol - and spare me the lecture about it I know it's foolish/irresponsible when you're not actually trying for a baby blah blah) but there has never been any signs of a baby or anything! I'm just getting worried because although it can take longer for people to conceive, everyone is different, I don't want to go through what my mum and dad did. I have regular periods (albeit heavy and very painful) so that side of things is normal. Has anyone been in the same boat? Can anyone give me some advice? Thank you ladies x