Half Of My Hair Is Straight And The Other Half Is Curly

All i do now is using waver to the bottom part if there s another solution please tell me.
Half of my hair is straight and the other half is curly. My hair on one side of the head is pretty curly and the other half is just straight. I don t know what causes this but i figured out that this could have to do with my hair routine. I am between a 2b c. I am desperate for help with my half wavy half straight hair.
The top of my hair is curly and the bottom is straight it look so funny and confusing and idk how to deal with it. Like not even wavy just literally straight. From mid skull to the nape of my neck it is wavy frizzy and puffy. Also please dont say to straighten or curl half.
And it bothers me i shampoo and condition all of my hair and rinse all of it out. I hate this so much because i always get weird stares and i am really insecure about it. Why is the bottom half of my hair curly and the top half is straight its so weird. I just want to know why my hair grows like that.
So here s how i treat my hair. This is my first time using naturally curly so please don t judge my hair when i was younger use to be curly all over but since puberty my hair has gone half curly at the bottom and straight at the top. I cannot cut the straight part. I am getting very frustrated with my half and half do.
I would like to find some options to get the straight portion of my hair to match the. Does anyone have any tips or ideas as to why it does this. I try and add extra product to either part but nothing is seeming to work and it looks really strange to have half my head straight and the other. And there is this one stupid section of hair by my face that doesn t curl at all.
My problem is that only the bottom half of my hair curls and the top stays mostly straight. The top to middle of my head is stick straight. You can imagine his curls but my hair is both curly and straight. It is just that the bottom layers of my hair the ones that have roots from mid high ear and down is absolutely pin straight with a slight curl out in on the bottom while the rest is wavy curly.
Cuz i might as well straighten my hair again so i won t look so stupid. Half of my hair is straightened and the other half is curly.