I keep quitting jobs?

I've gone through three Jobs in the past 6 months. I use to be able to hold jobs for a while, but lately I'll quit after a month. In 2013 I worked as a janitor for about 8 months, and than joined a landscaping company. I loved that job. I loved my co workers, and I loved the hours. I stayed at that job for almost 5 years, but than it failed, so I lost that job. I than started a job building trusses for a construction company. I hated that job so much. My co workers were a couple of rednecks who thought they were better than me, and got mad when I didnt understand something. I quit that after a month, and when to work with my dad, and brother hanging gutters, but I didnt want to put up with my brothers temper tantrums every day so I quit after a month. That was a couple months ago. I got another job at a crab processing plant a couple of weeks ago. The work is hard, but not to the point were I feel like collapsing. My co workers are awesome, and management is really happy with my work ethic. The only thing I hate about it is the hours. 12-14 hours a day 7 days a week. If it were 8 hours a day with the weekends off, than I would have no problem with it. Well, I miss spending time with my family, and I hardly have any time to do my favorite activities, or I'm just too tired, when I have the time. I really wish my landscaping job could have lasted, because I just cant find anything that is at least tolerable. What should I do? Sorry for the bad grammar?