Guilt

So I'm 18 and found out fairly recently that I'll be having twins(these two will be my first babies), but I'm feeling this overwhelming guilt about how easy it was. this pregnancy has been hell, but I feel like it should be worse. I have friends and family who are/have struggled to conceive or they got so close and lost it, but here I am pregnant with twins without really trying and it's been a mostly healthy pregnancy. Anyone else ever felt this way or have any advice on how to shake the feeling?