Having trouble getting pregnant!

I know how all you ladies feel. I am 27 years old and me and my husband have been trying to have a baby for the last 7 months and nothing... It is so frustrating when everyone around you is getting pregnant and you are not. I have had 4 people in my family and 6 people in his family not including all of the 10 or 12 friends that are all pregnant or have had a baby in the last 3 months. It really makes you depressed when you think about it... It seems like ever where I look I see a pregnant woman walking around or hear a little baby crying every where. Why me??? I just keep asking myself what is wrong with me, why can't I have a baby now too. Everyone is always asking us when we are going to have a little one. We so badly want to but just can not seen to make it work. WHY??? Everyone tells me to not think about it and it will happen, but how can you forget about it when everyone just keeps bring it up.