I was raised by a single mum (divorced parents), and a big part of my experience was that you’re always at the “mercy” of that one parent. I don’t mean this in an abusive/cruel way. Rather, if your parent is being unreasonable towards you because they’re just having a really bad day (happens to all of us - we’re human!), you don’t have another adult to “appeal” to who could step in and negotiate that situation for you. I’m sure that happened from my mum’s perspective too - she couldn’t ask someone else to step in when she was feeling too tired to deal with me and my big emotions (coming partially from being a normal teenager & partially from the trauma of divorce). I was a little jealous of friends who had two parents, because I could see how that improved their family dynamic and how parents helped each other to de-escalate arguments with their children before they got out of hand.
That being said, I wouldn’t completely rule out single parenting though. There are a lot of unconvential family set-ups that work beautifully, and the parents don’t have to be the only safe adults in a child’s life. Grandparents & family friends, etc. can have a huge impact on your upbringing. You would proably really need to have that “village” in place though before your child is born and good, reliable network of support to fall back on when you need it (be it babysitting, emotional advice, dropping off meals for you, contributing to the child’s emotional & intellectual growth, etc.). (I’m also plugged into the adoption community through friends and family members and in some cases social workers recommend that a child goes to a single parent home because that is the environment that would best meet their needs. Therefore, I don’t think a single parent household is necessarily always a negative thing.)
It might be a good idea to look up stories of people who have decided to go at this alone and see what they say about the kind of struggles they’ve faced & what the positives of deciding to go down that route have been. That can help you reflect on whether or not those are the kind of challenges you would be ready and willing to take on. However, I don’t think you have to make up your mind either way yet - your life will look very different 12-15 years from now, and when you get there you’ll have a better idea of what’s the best situation for you. For now, I’d just keep your mind open to different options and see where life takes you.
(Edit: actually, speaking of adoption, I think things people are asked to consider before adopting alone apply to using a sperm donor alone as well, so this might be a good list to think through: https://www.first4adoption.org.uk/who-can-adopt-a-child/how-do-i-decide/single-thinking-adoption/