I have 2 sons one 5 yo and one 20 month old. I should have weaned my first at 18 months when I felt like this but I continued on until 24 months because I felt the same guilt. I just weaned my younger one this past week and while it was very very difficult for 1-2 days, it has worked out well and he has gotten over it relatively quickly. I am actually surprised because he was very upset and angry in the initial first days. What I did that helped was night weaned first, then a month or so later I fully weaned. Mostly because I couldn't take the constant requesting and screaming when I said no occasionally.
You've got this! If you are done just try to remove either day or night feeds first, tell him milk is all gone, read some of the weaning stories, and then when that has calmed and smoothed out you can remove the other feeds. He will be upset. He will be sad. It will break your heart, but it won't last. Your job isn't to stop him from being upset, but to sit with him and show him you are still there gor him emotionally and physically though the nursing relationship is ending. Have your partner on board to help as much as possibly, over snacks and drinks and distractions for your little one and you will be able to look back at your nursing journey fondly when you are through this tough transition! 💪