Can't calm baby 😢

I feel like I don't know how to calm my 3 week old baby down other than sticking my boob in her mouth. She's been crying a lot the past week and obviously I try rocking her or walking with her and just holding her, but I feel like the only thing that helps is the breast, whether she's hungry or not. 
I just want to cry. I feel so inadequate. 😢