I'm having an endometrial cyst on my right ovary its 3 cm big and I get lots of pain during periods and while passing stools its very painful,should I get pregnant to avoid it or can I wait for sometime my age is 22?

It is a MYTH that pregnancy cures endometriosis! Some women experience relief from pain during pregnancy, but not all, and it comes right back. Who told you that? If your doctor, please find a new one.
No one online can tell you what to do regarding treatment or surgery, sorry. It's important to make sure the doctor understands all the pain you are having. For now, warm baths, ibuprofin (more for inflammation, but try it) and Tylenol (more for pain) and possibly a prescription pain killer once a day.