I just told you how it was selfish: it was expensive. Wasting money on a comfort like that is selfish when I could be helping someone who actually needs it. Congratulating myself for ignoring real suffering in the world would be perverted. For what possible reason could I congratulate myself for saying, "Screw you poor people! I want cheese in my crust!"?
But I think I get it. It seems perverted in your mind to take selflessness to the extreme I'm talking about. But that's what "with everything in you would be". You do indulge yourself in comfort, and entertainment, and luxury from time to time, and if it isn't what you would call "too much" then it isn't a big deal, amirite?
Love others as you love yourself. What do you personally think that means?
To me, this doesn't mean neglecting my own self. It is Good to help people, obviously, but, for example, if someone is asking me to help them with something that I am simply not suited to do, would it be wrong of me to not help them? Perhaps I could try and find an alternative person to help them who would be better at that task, but I am not obligated to volunteer someone else to help someone.
Like I said, even Jesus needed a break helping people as sometimes He just needed to be by Himself for a time. That's a valuable lesson for us, regardless of what you believe about Christianity.
So I would suggest a balanced approach. You don't need to spend every single moment of you life helping people. Surely, helping people is valuable as volunteer work helps millions if not billions of people in things. But to say to never take time for yourself isn't good either. For example, in Christianity, we are supposed to take a Sabbath from out work we do one day a week and just rest. That is a Biblical command from God.
So could you have used that money to help some poor person in Africa or something? Sure, there's an endless pit of people to help and to give resources to. I myself was thinking along these same lines for a bit. The question of "am I doing enough?" is something I don't think God wants us to feel guilty about. Now there comes a point where you are not helping anyone with anything, and that is simply selfishness. But there is nothing wrong with me going out to eat once a week as a treat for myself. Balance.
That is why I said what I said when I bought up those Bible passages to you. They were there to illustrate a Christian ethic in helping people. What I said seem to be good solutions to your problem. I'll summarize them, in case you missed them before:
Help people materially and financially who are worse off than yourself. This means you don't have to fund something that isn't hurting for finances if you live on a small budget or something like myself.
Be fair with people. This should be obvious enough. Don't extort from people or get money from people dishonestly.
Further, you don't actually have to go super far out of your way to help people as long as you do help people when a need arises. I commented on this saying even trying to help people when the situation presents itself obviously isn't something I have a 100% success rate on and I know this because I have tried to help everyone who comes in my path who needs help.
Finally, I just wanted to reiterate this, as I think it sorta "solves" your problem you are having in a nutshell.
A more appropriate way to phrase it would be to always be on the lookout for people who you can help in both big and small ways.
But I would add to the above saying at the end, "and help them assuming you have the capacity to do so adequately."