I cringe when someone mentions pregnancy

I don’t know what it is. But when anyone mentions me getting pregnant or having a baby or possibly being pregnant I automatically have some weird, cringe feeling in my stomach.

I know I’m young but I’m 20 so I am an adult,

But I don’t have a stable relationship right now, and I’ve always wanted to get married and have my children or be pregnant and engaged. So when anyone mentions it to me I automatically feel weirded out, it’s like an aversion to it. It’s the weirdest inexplicable feeling ever, almost like a gut wrenching feeling.

Am I being immature? Or am I justified in feeling this way since I don’t have a solid foundation?