I became a mom at 19 and was also studying for a degree at the time. I ended up having to leave uni. My course was a very demanding music course, with the aim of becoming a professional violinist. We had to practise for six hours every day on top of lectures etc, it was simply not possible to continue. I've clearly not learnt my lesson, as I'm now 28 and juggling my second baby with a college course! However, if you can find a way to make it work, then do. I agree with other posters about taking time off at first. But don't think that it's the end for your education or ambitions! I would encourage all young moms to keep going.
Honestly, it was the loneliest and most difficult time of my life, but this was because I had very severe depression which had started years before I even became pregnant. I didn't seek help for about four years and every day was hell. But we made it through. And if I did a good job of it, with rapidly needing to grow up and having mental health problems, then most people can! I never realised how much I was capable of, how selfless I could be, or patient despite exhaustion, until I became a mom. You come across as a lot more mature than I was at that age, so it sounds like you're off to a good start already! What in particular are you worried about? I did find that I lost most of my friends, which is a common experience for older moms too, but the few that stuck around are still my friends today. One of them is even my husband :)
Do you have any specific support? A young persons midwife, etc? I didn't have much help in this way, but the little bit of help I did have was beneficial, with regards to what I was entitled to. I know there were also young parent baby groups, which i wish I'd attempted. I was far too anxious to go to any groups and often thought I was being judged. I have no idea whether that was true, but can say with certainty that I do not judge young moms at all. I greatly admire them, especially when they're doing it without a partner, and think they are hard working and amazing.