Why does my family guilttrip me for spending on myself when they never provided much for me?

why do i get emotional-blackmailed and blamed for getting a shoe (or anything for myself for that matter) for myself from my family and its fine they want me to spend on them? fyi i got anew shoe after 3-4 years of living with same shoe. they never got me anything.

I have not even lived with them for more than a month since I was 10. This is longest I've lived after university because its remote job.

Its not like they paid for my stuff. My grandpa did. My dad is not even employed. For university also I was ready to take a loan myself and they denied saying they'll get me a one with better interest but ended up not getting at all.

What tf do I owe them. Nothing. Still im okay with financing their expenses.

Why tf do I get blamed. This is bullshit