Is it possible I have OCD?

Hi, so I think I may be OCD. I took an online screening test, which I scored "likely" for OCD.

So these are my symptoms:

-Ever since I was little, I've had this thing with symmetry. If I do something to one side, it must be done to the other. When I was about 5, I had this book and there was a drawing of a girl wearing a shirt with a pink bow on one side of the collar. It bothered me that it wasn't in the middle, so I drew another bow on the other side of the shirt so it would be symmetrical.

-I have a fear of contamination. If I feel like my untensils or plate is dirty, I can't use it. If I handle something like bleach or even laundry detergent, even after I wash my hands I'm scared of getting poisoned.

-I have an eating pattern. I eat salad/vegetables first, then sides, then the meat.

-I have irrational thoughts of bad things happening. One time at school it was raining outside. I had to walk up the stairs to get to my next class, and because of the wetness outside the stairs were wet and slippery. I was so petrified of slipping on the stairs I almost couldn't even go up. I am also scared of being raped on public buses, escalators, elevators and my 2 year old brother dying because of me.

-Every time I put something in the microwave I have to open it every 5-10 seconds because I'm afraid it will light on fire.

-I can barely eat at other people's houses even if I know their house is pristine, because of the contamination thing.

-I can never throw things out. There's a pair of beat up, barely-working headphones next to me and I can't throw them away.

-Even if I know I've written a paragraph perfectly in Spanish I have to check it on Google Translate.

-Ever since I was little, I've had the need to touch things. I will literally go out of my way to touch something.

-My mom thinks I'm crazy because I keep my iPod and phone in their chargers at all times unless I'm taking them somewhere. Even when they're fully charged. I feel like I'll lose them or they'll get damaged if they're not in the chargers.

-I organize things so much. I have a special order for the perfume on my nightstand, my magazines/books, and my clothes.

So does this sound like OCD? I heard it was hereditary, and my mom has shown signs of it too.

Please help!