If any older ladies can help me...

I’m fairly young, still a teenager. I’m a virgin and I don’t plan on losing my virginity at all in the next couple years. The problem is, I get very discouraged when I think about motherhood. When I grow older, I want to carry my own children and be a mom, but how can I be a mom when sex scares me ? I tried to put a tampon in once and couldn’t even do that without wincing, and then feeling sick after. How would I be able to put a whole penis up there? Maybe I’m looking too far into the future, but I’m super worried about this kind of stuff...if anyone can help ease my mind about sex it would be deeply appreciated. Again, I’m no where even ready to have sex or lose my virginity, I’m just worried about my future as a mom. Any reply’s would be very very appreciated .