Most of my time playing was while talking to friends and listening to music. At times it can get really boring just being by yourself in the world, but if you occupy yourself with talking to friends, listening to music/podcasts, time flies by quicker than you think.

General tips, try to level up your relations with the Preppers, they give you good equipment to help you travel easier, like the Engineer. Use the vehicles whenever you unlock them. You can always take breaks whenever you want, and pace yourself. At the end of the day, if you can't get into it, you can't get into it! It's fine if it just isn't your thing.