update: I [16M] got into an argument with my older brother [26M] and told him he'll never measure up to our deceased father

i though i would provide an update to my first post.
someone advised me that i write my brother a letter apologizing, which i did. i apologized for being mean and hurtful, and that I was wrong for doing that. i also got him a separate card and wrote a message thanking him for everything he's done for me. I went to his house with my letter and card when I found out he was home to go talk to him, but unfortunately when I got there he was gone already, so I slid them under the door.
When he got back home he found them and read them, and then he called me to arrange to come see me. He came over here and I apologized in person for what I said. He was very straightforward with me and honest about my actions. He explained that the reason he had been avoiding me lately is because he needed some time apart because he was beginning not to like me. He said loved me, but I he didn't want to be around me sometimes.
That was pretty hard to hear. He said that lately I've just been not very nice, the comment about our Dad was by far the worst, but I make other snappy comments. He had tried to brush it off as me being 'just as teenager', but had now decided it was best to let me know. "Being a teenager is not an excuse to be a constant ******* to everybody at home", is how he put it. He gave a few examples and looking back he was absolutely right.
It was pretty upsetting to hear. I know he wasn't saying it to upset me, and I was thankful that he was telling me (or at least I'm thankful now). I promised that I would check my attitude, he said a little more thoughtfulness was all I needed, and that even though sometimes I act like an ******* he knows I'm not one. After we finished talking we hugged, he told me not to forget that he loves me and that I'm great.
Since then I've been trying to be more considerate. I really am trying to follow the advice he gave me. It's been a couple months now, and I'm happy to say that it's working. Our mom told me a couple weeks ago that Im a joy to be around. In the car earlier today my brother told me that its been really nice spending time with me lately. so thats good news.
TL;DR apologized to my brother for the terrible thing I said to him. he warned me that I was turning into someone that he didn't want to be around, even though he loved me. i've worked on fixing my attitude over the past two months, and today my brother told me its nice to hang out with me these days.
Edit: wow, wasn