Hi @Bananatime04
I agree with @Taylor-RO in that you are most definitely not alone in wondering about these big life questions. I have also wondered this many times before. The 'answer' to the big life question of what our purpose is and what happens after we die is definitely going to be different for everyone because it'll depend on personal values, beliefs, religion, life experience and lots of other things.
Personally, I'm a Christian but I can't say that I don't have moments where I get so confused and almost doubtful and unsure about things. This is where I think personal life experience can also affect how you think about these things and what your beliefs are. Mostly though, for me I try to think of it as the following- I'm living my life for the purpose of being able to help others and better myself. This broader but also in some ways narrow goal helps me focus back on the things that matter to me whenever I start to question these big things again. But yea, making smaller goals as well sometimes as your 'purpose' is helpful because it doesn't seem as pressuring or daunting, but can keep you grounded and point you towards a certain path 
Hope this helps! 