See if anyone can take your bird in temporarily - maybe a friend or trusted adult. A rescue might be able to temporarily foster a bird, and avian vets may also be able to offer emergency boarding if you explain the situation.
Contact the police. Threats to kill a pet are usually taken seriously and, depending on which country you live in, are considered a crime in themselves. There is a strong link between threats to harm a person's pet and threats to the person themselves: there's research to show that domestic abusers use threats of harm or actual harm against pets as a way of controlling their victim. I'm not saying that this is what's happening here, but it is a red flag.
The police should be familiar with organisations to support homeless youth. Again, these depend a lot on which country you're in and region - some of them can be very local. Depending on your age, you might have to go into foster care yourself. If you are a bit older, then they may be able to help you with finding somewhere to live.
If you can and have access to the documents, try to make a go bag in case you need to leave in a hurry:
How to make a go bag when leaving an abusive relationship
Things like your passport, birth certificate, details of any bank account(s) that you may have, any health records, any medications and some clothes would be ideal. However, if your aunt and uncle have control of your passport and other records, then don't worry about it. You must prioritise your safety.
I really hope that both you and your bird stay safe.