Need some advice, and feedback

[Keehar]

Hey guys, so here it goes, here's my first post/story.
Im 18 years old, turning 19 this July. Ive been having troubles with my hair since last year 1-2 months ish before summer. Then it started where one friend called out that my hair was kinda thinning. I have pretty thin but thick hair. (will share pic if needed). So what i mean by thin but thick is that i have curly/wavy hair, so when i dont apply water or hair wax, its thicker than a bush. My problem is that when i use hair wax i often see hair strands on my palm, is this normal?

I know its pretty early to think this early about hair, but i do care alot about my hair and better safe than sorry, am i right. So i started using oils like Castor, Coconut and Almond. And they worked good i got much thicker hair, could see less visible scalp after shower. Also a question, its normal to see some scalp with wet/oily hair right?
But yeah so after the oils my hair started looking much better. I also get my hair cut every 2-3 weeks cause it grows so ****** fast, and i like keeping it short on the sides. So i recently cut it, but this time he cut it so short that my scalp is showing. So i want some advice what i can do to have healthy hair, and get thick af hair :P my dad and grandad still have hair so i dont think i have genetically bad hair, just might be hair product or something. My hair has receeded abit, but i think that is mostly because of maturing. People i know have said that i have nothing to worry about, aswell as some hairdressers. Whats your take on this? Thanks for reading!