If I can't have a regular period how can I conceive?

It all began at age of 14 or 15. My very first period was concerning. Huge clots the size of oranges. Doctor said not to b concerned. Well after being sexually active I went on the depo Vera for quite some years. Following that I also found out I had hpv. I had cysts all over my ovaries. And had low grade cells that were cancerous. As for the cysts the doctor couldn't do anything because they were small she said they would just explode and hopefully go away. I beat hpv, my immune system I guess took care of it.(?) after the depo shot I've never ever had a regular period. Sometimes I'd be on it up to 3 months, or id skip a period, I'm never on time. Till this day my periods last upto 4 weeks. I spot on and off for about a week then I start my period. The only option they give me is birth control. I do not want birth control I'm already worried about conceiving.im afraid it will worsen my chances. Led alone i constantly forget the pill. Timers, nothing works... Need to add in the past I have had a cheating boyfriend that gave me chlamydia a few times but it's always gotten taken care of. once I didn't even know I had it so I did have it for a cpl months. I constantly have a bacteria infection this has been my whole life. At least 10 years. It's a reoccurring problem. I'm lost with that issue.and yes I've done everything I can to prevent it. Can having a constant bacteria infection give me pelvic inflammatory disease?? I've stopped going to the doctors because there's nothing they can do for the bacteria they give me medicine after I finish the medicine few weeks later it's right back it's a constant cycle the doctors actually told me that I cannot take the medicine like that because it can be harmful so I switched to a gel and the same issues no matter what I do it comes back. I have so many problems and I get no answers or results. If I can't have a regular period how can I conceive? I've tried in past relationships it's just never happened. Doctors have said "u can have children" I just don't even believe them anymore. I might add when the cysts ruptured the doctors said that the scarring wasn't bad And that getting pregnant that I should have no worry. I'm sry but I should have like a ton of kids right now. But moving forward from past I'm about to get married I'm getting older and I dunno what to do. I know his sperm is fine he has a kid and my previous ex also does. What's wrong with my body? Nothing's right. Plz help I know I had to suck it up and give all details but it could play a factor and I'm being honest. Almost 30 very concerned