I started a bounty and I did not mean to can I do anything to undo it. if there is not I request that there is a way to retract the bounty on the same day.
To be perfectly clear:
We expect you to take responsibility for your actions.
This includes every one of your actions on this site, but in this particular context, it's worth emphasising that it includes setting bounties, allowing other people to access your account, and lying or other deceptive behaviour.
If you set a bounty and then regretted the decision:
There is no way to retract or refund a bounty. Moderators do have that ability, which they only use in some rare exceptions, but your case ("I made a mistake") isn't one of those exceptions. If you don't want to set bounties that you don't want to give away then don't set them.
For more information, see the FAQ in the mother meta: How does the bounty system work?
If you allowed someone else to access your account and you don't like what they did with it:
This is still 100% your responsibility, and you need to pick up the tab for anything the other person did. If it's not to your liking, the only remedy is to be more careful with your account credentials, and with who you allow access to your devices, in the future.
If it was in fact you, but you're lying to us to try to game the system:
This is in no way different to lying to someone's face in real life. You're in a social situation interacting with other real human beings whom you're asking for help, in an environment where interactions are based on trust and with a basic assumption that you're acting in good faith. This means that you need to treat this exactly like you would a real-world interaction, and that antisocial behaviour is not tolerated. Users who don't stick to those rules can and do end up spending time on the "penalty box", in which your account gets suspended (for a day or a week, then increasing lengths of time) and you have no access to the site other than reading.
It really sounds to me like you're not always able to take your use of the site in a calm manner, and that things sometimes get away from you. Ask for help with this to the people around you, be they a parent, a friend, a sibling, a therapist, a teacher, or anyone else who you trust. There is a (very low) limit to how much we can do to help you with your use of the site, and you should build a real-life support structure that you can run things by before they start to spiral.
(Or that's my take, anyway.)
I want to add some more details regarding the feature-request part of this question... I should mention why I think adding provisions for users to cancel bounties is a terrible idea.
You should have found out how bounties work by now. There's a featured tab on the front page where your question is advertised. So if you want to cancel the bounty after putting it up, there's a possibility that people have already answered the question with that bounty as their motivation, or perhaps they're in the process of writing an answer. Or perhaps someone has seen your question advertised there and decided to upvote it. It's not fair for you to cancel the bounty after that: there's a possibility you've gained rep through the publicity, or someone has invested some effort.
And even if neither of those has happened in this case, it's possible that they would happen in other situations, and that makes canceling a feature which can be misused easily. Saying that there are tests to ensure that neither of these has happened before bounties are cancelled are too complicated to implement.
It's much easier to convince users to think twice before setting up bounties.