My dad always finds something he wants ever since I started stripping

Material items , I feel pressaured to buy them him , he has the money as he keeps bidding on things on ebay but every time we go out he always finds something then makes out he cant afford it then makes me feel bad enough to buy it him. I have to go out to pick up an army rucksack , Im beyond exhausted and I tried to tell him last night but he made me feel bad for not feeling like going so I had to force myself out of bed to go get it , im really burnt out from work but I havent had chance to sleep in yet , he knows im really burnt out and My main proitoty is getting my full driving licence , its meant to MY time off work , but it ceraintly hasnt felt that way.