What do I do if someone is taking pre-eminence of me?

I'm 17... I drive my moms to babysit (which is almost everyday) she allows me as long as I pay for the gas I use, which I do. The woman I babysit takes advantage over me motor privileges. She constantly asks me to pick her up from work, and drive her and her son around. I tried every way out of this. I told her shes using too much gas... and it's costing me a lot of money, and her son always eat in the car I pay 20$ a week to gain it cleaned, and I vacum it every couple of days too. She pays for the gas now, thats fine. I don't mind if she needs me to drive her around once a week to get her weekly stuff, I enjoy no problem with that. But theres times shes called me, just to lug her alone to the stores to get stuff for herself. I've told her I can't numerous times, she stops for a week then asks again and this continues. I lie to my parents because they catch mad that I do this. They even told her I'm not a taxi driver. Now I'm not complaining about her son, or her shes a really nice lovely woman. And I adore her son. I'd do doesn`t matter what I can for him, or do something for him if he asked in a heartbeat. It's just I don't like human being taken advantage of. She knows my weakness is that I'm shy and that I can't speak no to someone because I'm way too nice, but shes abusing the fact that shes know that. =/ And frankly I babysit for a lot less then the going rate even though I know she have the money to pay me. I take 20$ a day and I stay at least possible 4 hours, but on most days I stay around 6hrs. Thats what 3-4$ an hour... the going is 7-8$...I think I deserve a little more respect then a black cab driver.
You need to put a stop to this right away.

For one, under some insurance policies, there are strict clauses around taking payment for driving services - if you're in an accident, you could find yourself uninsured.

For two, you're right, she's taking positive aspect of you, and of your parents' generosity. Next time she asks, use your parents as an excuse. Say they found out about you driving her to groceries and such, and say your parents forbade you from taking the vehicle anywhere but to her house and back, and that they're checking the mileage. Tell her if she's concerned, to talk to your mother or father about it.
I agree with the first answer, tell her they found out.. someone saw you and told anything you have to do. But you do have to stop this, she is a user and needs to bring it together.
Answers:    this is silly. you dont HAVE to work for her.
tell her that she needs to find a new little one sitter, and that she cannot rely on a child " im sorry, i know you arent a child but technicalllly.." to drive her around. it isnt right.
and find someone else to baby sit. you are being taken advantage of. you necessitate to do the right thing. and quit.
First, negotiate an HOURLY rate near her, not a daily rate. IT's time you stood up for yourself. When talking to her, continue to describe yourself that you deserve more. Tell her that if she wants you to continue to babysit, you'll have to progress for an hourly rate of $8. If she only wants to pay you $20, solitary babysit for 2 1/4 hours MAX.

Also, tell her that you're more than happy to drive her to the IMPORTANT places such as work, as long as she pays the gas fees. Other than that, you are not her personal taxi. If she wishes for a taxicab, tell her she can call one herself, or walk.

For the son, speak about him that if he takes his seat belt off, next he can stay in his room the entire time you babysit the next two times.

Be strict! I know you're shy, but you have to continuously notify yourself that you're strong, and you deserve more respect and money. Even write it on your hand if you need to! Don't back down and consent to her whine. If you fail to get more, involve your parents. If all else fail, quit. You're worth more than being taken advantage of

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