Lonely in a happy relationship

I'm a stay at home mom of beautiful twins, I have a wonderful boyfriend who works so hard providing for our family, and an awesome mom who visits and helps with the kids all the time.

But I've been home with the kids for nearly a year now, and those four people are the only people I see on a regular basis now. I am beginning to feel so alone and bored and just sad all the time because of it. I hate leaving the house alone with the twins because they're still so young and it is so hard doing it all on my own.

I'm actually becoming nostalgic about when I used to use online dating sites because I would always have someone to talk to back then. I don't miss dating at all, but I miss having conversations that don't consist of household duties, diaper changes, and screaming babies. I just don't know what to do. Maybe this should've been posted elsewhere but I'm just at a loss here.

Edit to add this thought I just had. I'm only 20 years old, I got pregnant at 18, gave birth at 19, and had to put my educational goals on hold as well. Up until the end of my last semester in school I was hanging out with friends regularly from my college classes, even if it was just studying together. I had to quit my physically demanding job at the same time that that semester ended so basically all that social contact got cut at the same. I feel like it's all just been building up to now at this point and I miss it all. At this point this feels like more of a rant than anything.