17 days til baby shower

Mrs • I`m 33 w/3 daughters & a 1 son.. I have been w/my husband 15 yrs, but only been married 5 yrs
& I really wanna cancel. This is my third baby first baby shower. I just feel like it won't be a success. Anyone else ever had this feeling? I was really excited at first. All my decorations are bought. I just don't know anymore