When I was in third grade, one of my brothers was murdered. I felt all the panic of mortality, and intense, visceral grief -- etc that you might imagine. A few years after that, a cousin was stabbed to death. I didn't know him much, and I figured that was the reason why his funeral felt much easier.
My grandmother died in 2007, she was the sweetest lady you'd ever meet. It was even "easier" than the cousin's funeral.
In 2009, an uncle died. In 2010, an aunt. Another aunt died in 2013.
Another one of my brothers always used to say that he never wanted a funeral. When he died October 2016, some family threw him a funeral anyways. I felt like I was doing his memory a solid by not going. At an earlier stage in my life, when I was more self important -- I would have been livid at the family who threw a funeral for someone who didn't want one in life. Now I know stuff like that just doesn't matter.
The pain of losing a loved one has changed from an acute stabbing sensation in my kidneys to somber waves that roll over me, then recede. Getting better at coping with the deaths of those you love helps you come to terms with your own mortality.
Basically, don't worry about it.