Of course if he doesn't want them either. Yes, the majority probably want kids in their future, so that does limit your selection, but what desirable attribute (be it physical or emotional) doesn't?
As for changing your mind, I have found the reason WHY you don't want to have children is the biggest factor in determining if you will at some point change your mind. I have found this to be true in women who say they don't want children at a young age; if you look at babies and don't get that warm and fuzzy feeling now, that probably won't change. It didn't for me or friends/ other childless by choice couples I have known over many years. If you do get those feelings, then at some point, with the right person perhaps, or at some stage in your life, you are going to want to fulfill that desire.
As for feeling pressured by society to have children, a wise person does what they know is right for them. Some of the worst advice you get as a childless by choice female is that if you just have one of your own, you will feel 100% differently about it. As an animal lover, that is about as wise as me telling someone who does not look at dogs or cats and melt to get one. A properly cared for cat or dog is a lot of work and can run into the thousands, so if the joy doesn't outweigh the trouble they are, it would be a tragedy (for the dog and the owner) to take on that responsibility. Unfortunately, dogs/ cats are often given away or worse when the owners fail to take it as a serious responsibility. Those same people actually have children.
At 18, be focusing on your education and enjoying life. You will meet many different people in college and it will shape who you become. Once you know what you want from life, go get it and don't give into pressure on any subject because to be a mom or not, you still need to be strong emotionally and have a clear sense of who you are as a person and be proud of that. Good luck to you.
Married 20+ years and happily married/ childless by choice and yes, I felt the same as you at 18 and it never changed.