I felt something similar. I always thought I wanted a partner and kids when I got older (never had a crush either, just picked someone randomly because I thought that's what everyone did), but when people started expressing feelings for me in high school it made me uncomfortable and I absolutely did start ghosting them just out of the anxiety that came of it. I was in denial for a while, but I identify as aromantic now.
Personally, I don't think I need a partner to be happy as long as I have a friend and family, or even just a hobby I love, but you definitely don't have to grow old alone if you don't want to. There are dedicated friends you can find, maybe someone else aromantic, too, that you can spend time with. If you've heard of QPRs you might be interested in that sort of partnership. As for having a kid, that can be tough financially. Maybe if you do meet a friend you would want to co-parent with you could make it work.