Feeling depressed/Alone

my older brother died a couple months ago and i hate the way it changed me. like i feel like i only feel happy around certain people it’s rare to see me laugh and smile anymore i don’t like love and affection like i used to i isolate myself from everyone. i just hate it. and yes i have friends but i don’t talk to them as much i used to anymore. and i get angry/irritated at the smallest stuff. and i feel bad for my immediate family because they try and give me love and affection as a way to try and help me feel better but it doesn’t. and i hate that i can’t give them the same love they try and give me. and on top of that i really have no one to talk to. and it just sucks.