Dear cocobatter,
Welcome to the forum I hope you find it a supportive place to be.
I’m concerned that your mum has locked you in the house, it is a crime to lock someone in without their consent. You can call the helpline while your mum isn’t there and if you feel at risk you can call the police.
The helpline number is 0808 2000 247, it is 24/7. You can leave a voicemail via option 2 and provide a safe time for someone to call you back.
Take care and keep posting
Best Wishes,
Lisa