I'm losing sleep over these things and if I talk about it and potentially get some input from people who are on the outside and with opinions I respect maybe I'll feel better/come to a decision.

Currently: working a job which is good pay, but I'm not turned on by it. I don't fit in and either way, this is not a long term thing due to those things.
I have to commute just over an hour each way, but I'm free over weekends and the benefits are decent. Everyone is nice, but I'm just tired all the time and I don't feel we're the right fit for each other.

My other option:
I have been offered a job working with a friend on his coffee company. It's still small but with a lot of potential, has won a lot of awards already, and he wants me to be a business development officer.
He wants to pay me more in time, and as soon as he can, but at the moment, all he can offer me is essentially minimum wage, and there is no date for when this would change - it depends on the business.
He's not offering business percentages at the moment and for the first 6 months he wants me to essentially be based in London, running a new shop in Southwark (still an hour commute, and doing it at 5 am), before moving on to work on the online business and developing the website and basically all the marketing.
I'd really enjoy the work, but I fear it could be a massive step back in my career (especially if it doesn't work out) and the money will be a huge struggle with my loans etc. I also worry about the long hours for the little reward (with no concrete future reward available on offer as it is still an unknown) risking embittering me, having a toll on my relationship, and also on smaller levels, stopping me from having time to partake in hobbies (eg going back to working Saturdays = less playing football)

Help? Thoughts? Calling me a dick (Royter)?