To have or not to have more children, that is the question?

I have a baby that is 7 weeks old, and I know it seems early but I cannot decide if we should have more children or not. We live on a farm and my boyfriend already has a 10 year old. I told my mom I didn't want anymore kids and she said that I should have more so my baby will have siblings to play with. However my family lives 8 hours away so I'm doing most of this on my own with the little help I get from my extremely busy boyfriend, and to think of having a toddler and a newborn just sounds like too much work. I wanted to maybe hear from some who were an onlh child or had a sibling about 10 years older than them. My mom had 6 kids so it's hard for me to know what it might be like as an only child. Though she wouldn't be an only child since she'd have a half brother but 10 years can be a huge age gap for kids and you know how teenagers can be. Any input would be nice. I see it as, I'm the one raising the kids by myself while my bf works a full time job and works the farm. I still want to be my own person in the end too. I don't want my life to just be taking care of everyone else and not being able to still be me. I feel like with one child I can have that but if I have 2 it will be much harder. Plus my bf is 15 years older than me. So it's almost like when the children grow up and can make it on their own I'll have to start taking care of him more in his old age. Any inputs?