I put a password on the computer..

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yesterday, our old computer came from the shop and was fixed. we already had this computer fixed several times because of some errors that came up. we haven't used it and ignored it for 6 months or so since it got another error. recently my father decided to take it to the shop because me and my sister always take turns using his laptop. luckily, the computer got fix. now, i decided to put a password on it so that my sister cannot just use it herself without asking permission. she only likes to abuse using something and would not even think what will happen as a result. every time it gets to be fixed i am the only sharing with the money to be paid for it, she refuses to share even just a small amount and uses it when it is already fixed. this can be unfair because she will use the computer too. it got be annoyed and irritated. my sister tends to be too lazy and takes time on the computer several hours all day, she doesn't sleep that much, hadn't eaten yet, taken a bath, haven't fixed her bed, and help around a bit then sits and be always on the computer. i want to teach her a lesson because if not she can become abusive and be too much already with this behavior and attitude. do you experience the same thing? do you think i am selfish by putting a password on the computer? if you were in the same situation and have a sister like this, what would you do?