Therapy idk?

Something is not right with me and I don’t know why I feel like I’m so in my head. I feel like I’m not good enough. The person I was 5 years ago was this loud spoken strong girl would say what ever was on her mind so confident and now I sit in my house doing nothing literally nothing every single day and I just cry and think about how I use to be and wonder why I can’t be like that anymore and why that girl went away. I feel like I might need to talk to a therapist but I’m not one that like to show emotion to people I don’t want them to know how broken I am on the inside. I need some advice, how has therapy worked for you guys and if that didn’t what did.