Starting to feel some regret...

Does anyone else ever have times where they regret having kids? I have two kids, a 2 year old and a 4 month old, and I hate to say it but sometimes I think I made a mistake by having them. I had my first son at 21 and they were both planned. I had them during times in my life when I had no idea what I was doing so I was just like “hey, why not have a baby. Everyone else on Facebook is doing it.” Now that I’m older and have more perspective, I know what I want to do as far as my career goes but it’s just so hard to pursue it while taking care of 2 small children. The older one is right in the middle of the terrible twos and I feel like he is impossible to handle while the younger one is breastfeeding nearly all of the time. I get no time to myself and on the rare occasion that I do, I have to decide if I want to spend it doing housework, taking care of my personal hygiene, or doing an activity that I love and makes me happy. I’m moving in with my parents soon and plan on going back to school for my bachelors. I’m really excited mostly because I can’t wait to have some time away from my children. I love them so much but I just need a break from them. I’m with them 24/7 and my husband won’t even let me leave the house without taking the little one with me. I know part of the problem is PPD but I just feel like I’m drowning right now.