Age doesn't matter. You only get one mom. There is no "handling it better." She is special and one of a kind, and can never, ever be replaced.
I'm not going to tell you to try to focus on the happy things. Instead, I encourage you to embrace the feelings as they come.
When my dad died in March this year, every day was different. Inconsolable pain. Seething rage where every tiny thing infuriated me. Uncontrollable laughter that devolved into uncontrollable sobbing for no reason. Nauseating anxiety and dread (of what? I have no idea.) Complete numbness.
None of these, or anything else you might feel, is wrong. Happiness and peace will come in time. Embrace all of the feelings, because they are unique to you and your relationship with your mother. Even negative feelings are worth feeling, because they are part of loving someone. You can't have stars without darkness.
Much love to you.