If you say "nothingness" you're doing nothing but making yourself feel worse about the inevitable and truly, what's the point in that, have a bit of positivity, it won't hurt.
Why worry about the far-off future when it hasn't and won't come for hopefully, another fifty or maybe even eighty years for some of the lucky ones on here.
All things considered and all things accounted for, the most likely answer is that you go to heaven, simple as.
The real question is if God will let you into his kingdom or not and for many in the modern-age including myself to an extent, the answer is no and that's exactly why everyone should focus on improving themselves and how they communicate their feelings and thoughts to others as to not thread on the line of sin.
Well, that's what I think anyways, for all I know I could be talking nothing but complete jargon to myself right now but it's an answer and that counts for something I suppose, even if it's wrong.
“Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only the one who does the will of my Father who is in heaven. Many will say to me on that day, ‘Lord, Lord, did we not prophesy in your name and in your name drive out demons and in your name perform many miracles?’ Then I will tell them plainly, ‘I never knew you. Away from me, you evildoers!"