I'm 22 how I kno if I can have kids or not?

Must test equipment. If you went through a normal puberty and have regular periods, you can assume your equipment will work if there are no complicating factors. Pelvic infections (std's) can cause trouble with the fallopian tubes but if treated early they are usually spared. The basic test is a willing partner & some time. If unsuccessful after a year, a fertility evaluation involving you both would be in order.