Worried I don’t get enough opportunities

My gf and I have really busy work schedules so we don’t really get to have sex often during the week. I get anxious that I only have one or two chances a week to “practice” what I’ve learned here and when it doesn’t go well, I get discouraged and upset because it feels like I have to wait a long time to try again. How can I stop thinking this way? It’s not helping me with my anxiety.