Freaking out about the thought of death and loosing loved ones

I’ve just been going through it recently. I just turned 25 and the thought of my childhood idols being 40+ is just hitting different. I start panicking about the unknown. I want to stay and live forever and I know we don’t. I’m afraid of what happens. Do we never see our loved ones again and it’s just black nothing exists? If that’s the case I guess we wouldn’t know. Do we wake up in another reality and our family is there and we all learn from the past experience? Are we still alive in a none body way and get to be around family and we have all our old memories? I don’t know what to believe cause some people talk about ghosts or passing loved ones seeing old family members but what if that’s just our brain lying to us?

I’m an only child and not close to my cousins and my parents are all ranging from 60-72 and my uncle and aunts are all in their 70s. I’m single and was in a long relationship and we lived together and tried for a baby, but it was toxic and I have PCOS but it’s not for sure and now I’m insecure and not sure if I’m ready to date. idk if I even want kids or can have them. I’m worried that by the time I’m 50 I’ll have no one and by then it would be too late to have kids. I’m scared for when I’m super old and I have to say goodbye to this world and what if no one I love is there. Just nursing home people. I’m scared that around 60 I will have no one to talk to as my parents might be super old or gone. Who will I talk to on the phone to catch up on life? Who will I talk to when times get hard? Who will I hug when I’m sad? I’m scared of never seeing loved ones again

I just feel like I’m running out of time but I don’t feel ready for those commitments yet like marriage or kids and idk if that’s even what I want. I want to be super successful and wealthy that I could secure future generations but I don’t want to be that 35 year old single gal who works too much. I’m literally balling my eyes out