Ughhh just need to vent

Im almost 31 years old.... Married ....i dont have any kids but my husband has a almost 13 yr old daughter ...he is 32..... We been trying to have a kid for almost 6yrs with no luck 😢😢😢😢😢 i can't help but sometimes get jealous of him having a kid with someone else and i dont have any of my own....but sometimes i even feel like his daughter is not even his..... They dont look much alike..... Every month the same shit happpens i wait for a NO PERIOD.... And bam it seems like everyone and there grandmas get pregnant and not me ughh i fucken give up im already 31 😢😢😢😢😢😢😣😣😣😣😣😣😣😣😣😣😣😣😣