Feeling down

So my husband and I have been trying for our first baby for 7 months now. My husband is gonna this month on a mini deployment so we can't try this month. I am just starting to feel like its never going to happen. I know it should take a healthy couple up to a year but I see a lot of people that are getting pregnant within just a couple of months. :/ I just can't help feeling like its my fault that I cant get pregnant....