For context I'm a closeted m(17) and I have a brother(16).

Recently I decided to create a new instagram account where I could be more of my self to some close friends. As soon as I created the account the first thing I did was block my brother as I didn't want him to see the gay shit I was posting. Skip forward a few weeks, and my brother says he has screenshots of my post where it's obvious I'm not straight. Turns out he created a whole new instagram account under a different name just to see what I was posting and get an 'advantage' over me. He then started showing the screenshots to alot of people from my school and I've had to keep telling them it's not what it looks like. My brother is now also using his 'advantage' by threatening to tell my parents about the information every time I do something he doesn't like. (I feel like I'm treading on eggshells whenever im with him) So I decided yesterday to stay away from him but I dont want to ignore him incase he does tell my parents.