Curl pattern is cooked what should i do

Hi guys I have never used this app but I am in desprate need of help. I am 16 turning 17 and I have been wearing a headscarf(hijab) for about 3 years I have curls (about 3a pattern) and I noticed that not just has my hairline been receeding and my hair thinning but my curl pattern has changed. I put my hair in a lose bun and wear my hijab for 6-8h almost every day so the roots and the like middle of my curls is straight/wavy. Whenever i try to style my curls they just dont look good bc the curls are only at the bottom and in the middle its just frizzy wavy. I am starting to hate my curls it‘s so much work just for them to end up looking not that good anyways so does anyone have tips for me bc ive used to many different curl products and tried many techniques. I am so ashamed of my hair. I keep thinkikg of doing a keratik treatment or straightening my hair everyday but this is gonna ruin my hair so much. And also when I do my curl routine I have to wear the hijab so it gets ruined. Do you guys get my problem?