Grantdan...I feel for you. It sounds like you've spent 7 years chasing a skill you don't feel you want to pursue. That may be the case but as others have mooted....you are still very young
Given your age you can feel chuffed that you've worked out what you want (and don't want) to do already....
To give you another perspective, I found myself in your situation around xmas 2009.. I was living in France, following what I thought I wanted and a family man - I'll spare you the gory details but I found myself back in the UK dossing on my brother's floor and wondering where to go next. Like you, I knew I liked the great outdoors, I enjoyed walking, camping, learning about the countryside and starting to take responsibility for my actions in terms of ecology... this led me to look for work in the environmental sector. I had no qualification but was lucky in finding a six month seasonal job with The National Trust working in The Lake District; while there I realised most of the positions I dreamt of filling required both experience and qualifications so I went back to school.. (aged 45!).
I headed to a rural land based college near Edinburgh to take on an HNC in countryside and environmental management; I'm still there, two thirds through and loving it.
I've volunteered as an access officer for West Lothian, we have a week-long field trip to Rum in a month, and I am waiting to hear from Flat Holm in The Bristol Channel about working over Easter as an interpretation assistant and wildlife monitor... I can't wait...
Further, as money was worse that tight, I've managed through a nasty winter in a camper van...and guess what - I've loved nearly every moment of it...
I do understand your frustration at losing 7 years but trust me...the best is still ahead if you're prepared to grasp the nettle. It always is, no matter what your age.
Good luck buddy, the world is your lobster.