You say you're 16 - you can get a GP appointment yourself, show her you want to make steps to get well again.

If you're in the UK there are services you can self-refer to as well. The wait lists tend to be long, but it will hopefully show that progress can be made.

You could also try some techniques at home - with my students we recommend Healthy Minds (https://www.lpft.nhs.uk/young-people/lincolnshire/young-people/i-need-more-help/low-mood-and-depression) BUT this would be temporary until you could get further support

On that, you could talk to teachers at school, school nurse - anyone in a position with safeguarding will have a requirement to move things forward and be able to give you more specific advice

I know how horrible it feels to be in that place but knowing that feeling, you'd hate for anyone to be there. You know you fucked up so not going to belabour the point, but hopefully this will be the motivation you need to see that you. Need. Help.

Yes the world sucks, but rays of light like your mum (who obviously loves you very much) help people get through each day. Focus on those, and you'll eventually end up being a ray of light for others in dark times.

But get off reddit and get proper help man - seriously