How do you stop ttc?


So my SO and I have been ttc for over 2 years. And I'm tired of trying and then being let down due to AF coming to town or like right now. I'm 3 days late and still got a BFN. Everyone around us is/have had baby's and/or are on their 2nd pregnancy since. All we keep getting from people is "it will happen when you least expect it." "stop trying" How do you "stop trying"? I don't get it.