Will it ever happen.....

Will it ever happen???? :( we're been trying to conceive for 9 months now 4 of my close friends have now conceived and given birth or are about to give birth. Went to the doctor everything is fine, I just turned 30 and my husband is 35 we really didn't think it would be this hard to conceive (I know everyone is different but 4 friends got pregnant on their first or two months trying) each month I feel like I get depressed when AF comes. Now this month AF is expected 5/9 but I have cramps and an increase/snacky  appetite. What do you do to get out of this funk? How to you stay positive when it seems like everyone around you is pregnant or has kids.