Tired of doing it all!!

I'm tired... I have 3 kids (12, 9 and 6 months). The 12 year old is my step daughter who we have had full custody of for the last 3 years. I work in sales, I clean... I do too much. I manage the bills, kids college funds, doc apts, dentist apts, ortho apts, school activities, extra curricular activities and grocery shopping. When my husband walks in the door at 530 pm I make sure the coffee is made for the next morning, dinners on the table, kids homework and studying are done, all bottles are cleaned and preped, kids are showered and lunches are made for the next day, laundry is away, husbands clean pjs are by the shower with a fresh towel etc... I have been doing this (minus the 6 month old) for 3 years straight. And frankly I'm done. It never seems like it's enough and I feel like I'm at my breaking point. Today I may have started the crock pot and got 1 of the 3 kids showered but that's it and it felt damn good! I'm currently waiting for CCD to be over for my 9 year old and left him to do the rest by himself. Anyone else tired of doing it all so their spouse has to do nothing? Please tell me I'm not alone?