do people around you who dont understand mental illness say things like ''errrr just do shit i do shit why cant you do shit''

This is a common response from people who just don't have a solid grasp of what depression is and how crippling it can be. It's so sad that people who say this seem to think that whatever they and other people do can simply or so easily be applied to the depressed person's situation. We are all so very unique and are all in various phases and stages of life, love and our pursuit of happiness. Some of us are in a place where the best we can do is just maintain and have a daily mantra of "today I will try be a little less fucked up." That was mine for last year. It worked well for me. What I found in the end is that we're all beautifully broken. It's how we manage our lives and relationships in the best, not-so-good and worst times that help to define us. And it helps to have a friend or two by your side who's willing to simply be there for you, listen to you and not dictate what you should or shouldn't be doing. Just my humble opinion.

I work in the field so the people I know have a pretty good understanding of mental illness.

Not those exact words, but to the same effect. My answer is do you think I do everything the hard way because I like constant problems?

Because they don't suffer from a mental illness and really don't understand what you're going through.

People think that you can just pull up your bootlaces and suck it up. If it were that easy, people would.

Because they don't understand what it's like to have a mental illness

Some people try to help but don't know what to say and like you and others said they don't understand.