First, I'll say therapy is hella rad if you can afford it.

Second, this sounds about where I was until recently in life. This may not be helpful, but I find serenity in the void. I frequently look at things I'm stressing out about and ask myself, "Does this actually matter in the grand scheme of things?" and find comfort in my inevitable "No, it does not." Embracing the void has allowed me to focus less on the negative in my life and to convert my anxieties and stresses into motivation to pursue things that I actually care about and give me purpose in an otherwise meaningless existence. I can hear the libs heckling me already for being openly nihilist, but reading about nihilism helped me for the better.