Do I have OCD?

Hi, I’ve noticed recently that things I do, can be related to OCD.
I’ve been like this my whole life, so I’m finding it weird that I’m only noticing it now. I guess when you don’t know any different it’s normal to you right?
So, When I was a kid, I would be afraid of being on my own. For fear of either being kidnapped or killed even when I was in my own house. I would hear any kind of noise, Even ones I would recognise. And start thinking of possible, and even impossible scenarios where i could possibly get hurt or killed, or my family.
When I turn my straighteners off, I go back into the room about 5 times to make sure they are actually turned off. I’d lock the door to my house and go back and check it like a million times, not convinced that I actually locked it. If I touched something dirty I would wash my hands quite a bit, till I was satisfied the germs were gone. And even then, I wouldn’t touch my food for hours.
It’s the same with illnesses, at one point in my life I was convinced I had a tumor, breast cancer, appendicitis, having a heart attack, heart problems, poisoned, I even thought I was pregnant (even though it wasn’t possible). When I get an idea into my head, there is nothing anyone, not even a doctor can say or do that will make these feelings go away. I think I need help this is really getting to me.