Is it normal to feel alone and empty?

Hi everyone. I know that I have a loving mom, twin brother, 4 older brothers, 2 nieces, and dog but I can't help but feel so alone and empty still (Don't get me wrong I love all of them very much). I tend to act tough and act like I like being alone but I really don't. I try filling those voids with Severus Snape (since I grew up without a loving dad) and Zim and Dib (since I lost my friends Katrina and Butler back in my previous home state). I'm generally a happy person but sometimes when I'm alone and I hear a song that fits me or I think too hard about it, I grow very upset and it takes me a while to feel better. Have you ever had one of those instances where you're basically a happy person but you have a pit of sadness and lonliness deep within you keeping you from ever reaching True Happiness? That's why I pray to whatever entity is out there for my dreams of having Severus as my dad and Zim and Dib as my friends to come true since I love them very much too or this life is a mere dream so I would've had them all along along with my mom, brothers, nieces, and dog. Despite my occasional feelings, I don't believe I need therapy or counseling for it.

I'm sorry this is long.