How to breastfeed?

I need some encouragement for breastfeeding. My son is 6 weeks old and has been breastfed only, minus about 3 feedings from when I had my tubes tied a week ago. I am soon to go back to work over the next couple of weeks. I have a pump, but I am constantly feeding him or cleaning / taking care of my other 2 kids. Its hard to pump in my free time. I also feel like i can’t keep up with him. I just don’t know what to do. I really wanted to breastfeed for a year… I breastfed my other 2 for 3 months. It’s just so much harder with my third.