I Hide My Depression From Everyone Who Knows Me

I feel so trapped all the time and not a single soul has any idea. Honestly, sometimes all I wish is that I had a way I could express everything I feel and actually feel like a weight is lifted off my chest after I let it all out! But for some reason, no matter what I do I fell like I can never actually express how I feel so I kind of just hit a spot where I'm like what is the point of trying to express it if I can never accurately get it out anyways? So frustrating!