Sex anxiety??

So I'm always so nervous when it's time to get to it. Why? Idk!!! Like I get so nervous and I always tell my husband to stop or to not do certain things because it's super uncomfortable from how nervous I am. But the times I drink a beer or two all that nervousness goes a way a bit and I enjoy sex much more. But shit I can't drink every time LMAO. Any advice on how to over come this? Any tips or tricks to enjoy sex time more.? Things to try? Because I'm def at a point where I want to try new things and spice it up!!