Is it normal that i'm left handed, but not completely?

It's quite normal since we live in a world where roughly 90% of the population is right handed. I've heard many lefties being able to do tasks with their right hand.
I remember in grade school, one of my friends was a real ambidextrous. He would switch from his left to right hand quite often, though he prefered writing with his left. I never really gave it much thought back then, but I am quite envious now.

if you cant write with your right all that is left is your left

Not everyone is purely left or right handed. Mixed handedness is extremely common, I'm a mixed leftie who can do certain things only with my right hand.

I find this true of a lot of lefties. The world is mostly designed for right handers so you were likely taught to do things from a right handed perspective. And having your left hand be more dominant gave you the ability to things from both perspectives.

I was raised by lefties and my older sister is a leftie but I am right handed. I can do many things equally with both sides because of it.

I was born in the 70s and back then it was common to switch lefties to eighties. As a result I am ambidextrous. I write with my right hand but eat with my left. Other tasks I barely pay attention to but if I think about it I do them with one hand or another with no decernable pattern.

Cut off your right hand.

Regardless of you being ambidextrous everyone has a dominant hand. You are left handed if you put stuff in your right hand and can not hold it correctly. Generally your body is programmed to favour one side of your body for these type of things. So a left hand person has issues holding with right hand since than they hold it funny. A person who is right handed cant use stuff made for left handers since.

No, I don't think it's normal at all. In fact it's quite rare. Ambidextrous people are very lucky.
It was amazing to see my father, a surgeon, begin an incision with his left hand, flip the scalpel into the air, catch it in his right and continue cutting, barely missing a beat. He could pitch or bat on either side, giving him a huge advantage as a ball player.
Me, I couldn't use my left hand were my life to depend upon it. A tad envious I was.
Enjoy it, you've got it made in the shade.

I write and eat left handed, but throw and bowl right handed. I taught myself to use the mouse with either hand.

The word is 'ambidextrous'.

I am normally right-handed, but trained myself to do many things with my left hand (when I had broken bones in my right hand / wrist / arm), and I have retained much of this ambidextrous ability since.

I write left but use scissors or screwdrivers right.