Is it weird that my hairline starts behind my ears? In the Norwood scale theres always hair there even if they have gone completely bald.
I can clearly see that there is an area of discrepant thickness in this picture, as well as the one you posted in post #15.
What it is, I don't know.
There are really two types of hereditary hairloss, one is "diffuse" where you thin all over the top until nothing is left except what is on the sides and backs, and then there is the receding type where it start on the hairline and temples and pushes gradually back. You may have this, you may not.
There are a number of health conditions that cause hair loss and I believe a dermatologist is the best place to go as they are well versed in hair loss in general, but particularly hair loss due to health conditions/ scalp conditions.
There are really only two recognised treatments currently if it is hereditary.
Minoxidil which is a topical product you apply to the thinning areas which I think a kid 'could' take, and finasteride which is a drug which pretty much zaps your bodies ability to make the type of testosterone that contributes to hair loss, but is obviously not safe for someone in puberty, or really anywhere near it.
So minoxidil could be an option for you worst case scenario if a derm identified it as hereditary hair loss, and then you could consider finasteride at 18/19 which is effective in most people for stopping the hair loss, and in some even regrowing, so all hope is not lost in that event.
As far as being too embarrassed to talk to your parents about it. I'm sure they care about you a lot and if you let them know how much it's troubling you they will probably be able to see it from your side of things soon enough and want to help you be as happy as possible. Pretty much all parents (except the pathological .0001% that end up in the news for sick sh*t) are really protective of their children and want the best for them always and love them loads even if they don't show it and you don't think it.
I know it is so daunting and embarrassing talking about it to anyone really, especially the thought of going and seeing a stranger (dermatologist) to talk about it, but believe me, medical practitioners have literally seen EVERYTHING, and a young kid worried about hair loss who he may even confirm to have some is not something they will give a second thought to, at least not in a negative way, in fact they will probably be really keen to help you.
When I had just turned 19 I realised I had diffuse hair loss myself and I was so embarrassed about it, but if I could tell the me of back then anything now, I would say no medical practitioner is going to judge you or bat an eyelid, but a good one will be really interested to help you as much as they can.
In saying that it might be nothing, but I do agree there looks to be a discrepant patch of thickness on the sides in the pics you posted.
You might also have a hard time convincing your parents if they are anything like the people on here so you might want to find some 'before' pictures if you can too!
Good luck bro!