Is it selfish to pray for God to end your life?

I recently lost my mother 3 years ago to cancer at just 52 and her and I were VERY close. She was everything to me she was like a big sister, best friend, etc and I I've had no other friends because I never met any like-minded people like myself so me and my mom had may things in common and did so many things together. there's so many things that I miss about my mom and I cry myself to sleep every night thinking about her and this pain will never go away.

Ever since she passed away, life has never been the same. Its A very lonely world and I'm constantly sad and depressed about it and she stays on my mind 24/7 regardless of what I'm doing I can't stop thinking about her I just miss her so much. I'm just tired if hurting and crying so every night before I go to sleep, I pray asking God to take my life so I can be in heaven with my mother because that would make me truly happy. My siblings and the rest of my family are of course still saddened and hurt as well but I believe I'm hurting far much more because I was the closest to her and her favorite child so losing her was the worst thing to happen to me.

And yes I know that no one lives forever and that we will be gone one day so please spare me with the "were all gonna die" speech.

I can't help how I feel this pain is hurting so bad but I truly feel that death is the only way out I don't know what else to do.
Is it selfish to pray for God to end your life?
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