I NEED HELLPPPP!!

So I'm 14 and my hair has always been kinda thin but for the past two or three months my hair has been thinning drastically. I've changed shampoos I've cut down how many times I shower to every other day (I use to take two showers a day) and I don't know what's going on. PLZ HELP! It's super thin and I'm getting kinda nervous and idk how to stop it or get it to thicken back up.