Should I leave my job?

I'm relatively new to being a mechanic. I got my first job as a mechanic at a mom and pop shop by me. I'm kind of conflicted because all though I do kind of enjoy what I'm doing its not exactly what I want to be doing if that makes sense. The shop I'm at is a complete mess not organized at all. Also I'm getting paid 10 dollars a hour under the table working 40+hours a week Monday-Sunday. I'm not learning anything. Another problem is I've grown so close to everyone at the shop. We are all friendly and sometimes even hang out outside of work and one of my friends is the Owners son who works with us. but I know I can be making more else where. Hell even the grocery stores by me pay more than that. I've been here for about 4 months do you guys think its time for a change? I'm also really nervous I feel bad like I'm screwing them over because its almost winter and I don't know if they will find someone else during this time. I just want some opinions thanks.

Should I leave my job?
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