Coming out concerns.

I know this subreddit is probably full of these kind of posts and that the general advice is probably the same everytime, but I wanted to make a post that fully applies to me.I'm 18 and am a closeted gay and generally shy. I have accepted my sexuality, the only reason I haven't come out of the closet yet is because I'm scared. Scared of what would happen after I've come out. Scared that people would treat me differently. Scared of the difference it would have with my "straight" (closeted gay) life. Scared of the judgement and I just don't want things to change.I know my parents and family would accept me, my closer friends would too. But there is still this fear that some things would change. Another thing I keep considering is my brother. I have two older brothers that are twins. One of them is most probably gay and I don't want to give the "burden" to my parents of having two gay sons. As I already said my parents would accept us but that doesn't mean others will, I can imagine people thinking there is something wrong with my parents, with their way of raising us or with my family. I know I shouldn't care what other people think, but I do care, even if you won't hear me admit it in real life.The worst part is I can't even talk with my brother about this, because he is closeted and we don't really have a good bond. We're just too different for us to be really close.So I need your help/advice or anything you think could help me.TL;DR: I'm gay and scared of coming out. My family and friends would accept me, I'm my own problem. My brother is also gay so I feel even less comfortable coming out. And want so advice or help.