Losing a parent

I’m barely 19 and I just lost my dad, I have been acting like I’m okay because my little brother isn’t handling it well at all but I’m not sure I’m really doing well either. When I start to bring up how I feel to my mom I feel like she just gets annoyed with me and doesn’t want to listen. My best friend also just lost her dad so I feel guilty talking to any of my friends about it because I don’t want to feel like I’m stealing the show or being over dramatic. SOS idk how to handle this and feel totally alone