First of all girl, you CAN continue! You can do it. Fight for this marriage! Do you go to church? You can counsel with someone there or find a church to get counsel. Secondly, what is keeping you from being "childlike" with your husband. Exercising would actually help you with depression and dealing with this. He wants to be active so why not join him. Or find something new to do together! Ask him what you could do. I have been there and believe me it is better to work on what you already have, because everyone has issues! Learn to love and respect each other again! If you want to pm me you are welcome to. I'm off to bed, but will check in on you later. Take care and remember that God loves you! You are His precious child!
p.s. Get yourself some niacin. It helps with depression and anxiety. Just read up about it, because taking too much can make you sick (it can also make you flush). Try 50 ml 3x a day for a week then go to 2x and then take it only when you need it. That is my personal recommendation, but do some research for yourself.