Endings

I just finished a nuetral ending and have decided to do both pacifist and genocide. I decided genocide first so i don't end up feeling real bad cause Ii will beforend them all after. I started a genocide and scrolled throgh these commenbts. Supposedly my pacifist won't be the same after a genocide. What does ths mean? Should I reset and do a pacifist first and deal with the guilt... 

neutral or genocide route?

So, i just finished my run (i guess), as far i remeber in my playthrough i just killed a lot of neutral monsters + Undyne + The big puppy and overheated Mettaton.

So my in the Asgore fight i chooso to mercy him then Flowey came and killed i got to a dark room and a save file appeared when i got to the sabe Flowey destroyed it and become a big monster with the six souls, after trying to kill her the game restarted and after a couple times trying to beat her with the help of the souls i did it but after i killed her i had the chance do mercy or kill, and i choose to kill her, then i got a text message or whatever from Sans telling me how they where helping Toriel and how Toriel and the monsters decied they were going to kill all humas if they got to undearground. After that call/text message the games end and if i reload my file i got to the room before Asgore fight and pretty much it repeats if i try to fight everything again. Is that an ending at all or i did something wrong ?

I don't know what this ending is called, but after killing Asgore Flowey took the souls and the game closed. Now every time I try and play the game I have no save files and I have to fight Flowey. Seems impossible to beat, any advice?

I ended the game with a battle with Flowey, Then the game showed me the last place that I saved  the game; I  tried to don't have mercy with Asgore to see if anything changes but flowey appear again and kill him telling me that nothing will change if I try a different end. So I restarted the game and some things were really different, Flowey didn't appear at the beginning and Toriel already knew that I prefer cinnamon and she told me that she felt like I was an old friend. wtf is happening, the game didn't end??

mine is pacifist

Hi, I have a question... why is it that I killed Asgore 8 times and killed in 1 time... that nothing happened? Because the past two other turns (one spare and one kill), Flowey said "Don't you have anything better to do?" And I don't know what I'm missing...

I've killed Toriel

I've spared Papyrus

I've not gotten into a battle with Sans yet

I spared Undyne (when she collapsed in the Hotlands I gave her water)

I spared Mettaton I think... I don't know what happened to him though

I've spared the king (Asgore) 8 times and killed him once

I've defeated Flowey's omega form and refused to kill him.

I've spared Miss Muffet

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Some extra information is that I've killed 51 NPC's. I need help!!

Why did the genocide ending not finish no credits no nothin' Jesus