What do I do?

I am 23, married for almost 4 years and my life is dryer than stale bread. My husband and I are both unhappy and want something else in life. We don't regret getting married... All the time... And we both deal with depression and anxiety and we want to get me evaluated for PTSD and I just feel pointless in my life. It could have gone in such a different direction if I would have just took chances and focused on just me. My husband feels the same way about his life so we literally just sit and talk about what we could've had. I love him and he cares for me but I just worry bc I do want him with me through it all but I don't want us being unhappy. I have plans in my head but actually doing them seems impossible and unrealistic. We want to do something with our lives besides stay in our camper with our pets and no ambition and no change and just the same old thing every day... We are young so yeah we have time to do things but what things? Like we are both so disappointed with our lives and I just want to make him happy and be happy myself. Any thought?