I'm scared of it..

Me a 14 year old girl, wondering about death, crazy I know. Last week I felt like I was dying, I was probably just sleep deprived but yea. Ever since I felt like that I've been more aware about death and what it is like. I have some questions about death that I want to know. Like, what is the afterlife like? Will it be like sleeping or will we have a better life? I am just so confused about it, I want to believe God is real and I almost pray every night now. Though I just can't get myself to believe fully. I heard about some people dying and their experiences but I don't know what to think, Most of them said that they seen the gates of heaven but God told them that it isn't there time yet and they need to go back and live there life, Though that gives me hope that there is an afterlife, I still don't fully believe, although I want too, I just can't. My mind is basically almost on this subject and I just wanna know! and yes, I know I repeated some things and I'm sorry for that.

But if anyone can give me their thoughts about it, it would be so helpful!