I can’t do this anymore

I’m a single mom and live with my parents. My son is 9 months old. I take online classes for my masters degree and work nights. I am so lonely. It’s just me at home with the baby all day until my mom gets home and I literally hand her that baby on my way out the door to go to work. When I get home at night everyone’s asleep so I study for a few hours before I go to bed too. My family’s gone all weekend too usually so it’s just me and the baby. We go to the gym, the park, go shopping, story time at the library, swimming lessons, but I’m always bored and lonely. It’s so bad that my depression is coming back. I have a few friends but they’re too busy to talk and when we do hang out I spend the whole time entertaining my son instead of visiting. I’ve gotten a babysitter a few times so I can go out with friends by myself but it doesn’t fix anything long term. Don’t get me wrong, I love my son more than anything. But I can’t go on like this