I feel numb and empty. Whats wrong??

Its so weird. See, long story short, all this stuff happened to me a few years ago. My mom left me 6 years ago (she would come back for a little bit and promise she was staying for good before taking my dads money and leaving again) and did a whole bunch of drugs and came back pregnant. So then I had a new brother, but after actually connecting with him, he was taken away by CPS. She’s been clean ever since and actually has a job now and everything. But just recently, there was a shooting right outside her window. They had a shotgun and were shooting out her neighbor’s windows. When she told me, all I said was “Oh.” I just felt this huge amount of indifference. And its not just with her, its with everyone and everything. Before my trip to Europe, people asked if I was excited, and I had to fake enthusiasm. I mean, seriously?! I got to go to Europe and I couldn’t even be excited about it. Yeah, I was glad I got to go, but thats it. And now I always feel guilty after eating and the only thing I really get sad about (or think about long enough to get sad about) is my dog possibly dying soon. Something’s wrong I think. I never even got angry at my mom for leaving or losing my brother. I still don’t get angry. I was very sad the first few times she’d leave and come back, but then it just became a part of my life, and I stopped crying about it.

I’m not depressed or suicidal, I just don’t really…feel that much? And I guess life just seems…really pointless. But I would never take my own life, no worries. Oh and I’m a 16 year old female.