Hi Everyone! Long time lurker of Reddit and lover of Mark Narrations on YT. Came here for some advice as I literally can’t judge the situation at this point. Also I am a waffles so I apologise in advance for the ramble.

For a little bit of background, I (f20) have a series of health conditions (feel like a medical dictionary😂) and one of those causes joint dislocations, especially in my knees and shoulders. I think the best way to describe it by looking up https://en.wikipedia.org/wiki/Genu_recurvatum and seeing the pictures. It causes me immense pain and difficulty walking and along with other debilitating health conditions, I qualified for the enhanced rate of both sections of Personal Independence Payment. This allowed me to get a motability car,along with my own salary, to support my mobility as a priority. I personally am not allowed to drive because of my health conditions so my dad graciously drives the car

Anyway, my mum decided to take me out because she wanted to cheer me up. Simultaneously, my sister (f20) was also working that day so we thought it would be a good idea to drop her off first and then go into town for a few hours and then be collected. She had already upset me by saying I had hjacked the car(…my own car) and shouldn’t of been able to come. My sisters shift was extended unexpectedly so she asked my dad to pick up her laptop from home to study during her break. My dad agreed to this and since he was coming to pick me up anyway, he decided to drop it off at 12:15. My sister was not okay with this and wanted it to be dropped off at a much later time. My dad then said he couldn’t keep driving to and from home multiple times because of fuel costs and allowed mileage (imo he is also allowed to have a life where he chooses what he wants to do in a day e.g his gardening instead of being a glorified taxi service). Therefore my dad said only 12:15 would work because I needed to get home.

My sister starts texting me, moaning about him prioritising me so I responded that I didn’t do this arrangement with my dad on purpose( it was preplanned). She then said that I couldn’t get picked up by him because it was convenient for me. To play devils advocate here, I could get the bus but getting to the town bus stop and then from the bus stop to home would cause myself immense pain and I would very likely not be able to walk for a few days after that.

I usually wouldn’t respond to my sister and let myself suffer just to keep the peace but because I was already in a lot of pain, my patience was wearing very thin. I explained why I have the car and that I needed it to get home in order to rest and then do my own work. I then said that I am technically allowed to use the car as its main purpose is to support me. Its not like she makes any contribution to the car at all (e.g fuel, extra mile fees) and it was me who paid the massive deposit etc. She then called me narcissistic for saying that I control the usage of the car( for the last 6 months she has been able to use the car whenever she has wanted like going to work and I still have no problem with that as long as I'm still able to use it to live my life as well) and said I was going on a power trip.

I guess my question to you all is were my comments narcissistic and power-trippy and if so what can I do to make things right?

Thanks☺️