You're too young to be killing yourself or even trying to. When you are old, sick, in constant pain, can't breath properly, struggle to move around and have buried all your friends and family, then kill yourself, but wait another 80 years before thinking about it.
Go to your doctor and ask them to refer you to a counsellor. Your mum doesn't have to know about any of this. Counsellors are discrete and deal with people on a daily basis. Find one you are comfortable talking to and spend some time chatting to them.
Most countries have free counselling services so you shouldn't have to pay.
If you don't want to talk to a counsellor, go visit a church and talk to someone there.
Life does get better and it's just a matter of holding on until you can get out of the place you are in. In the mean time, try to get out of the house more and go for a walk, sit at the park, visit friends or family. Pop into the library and read a book. Take up gardening or photography.
If worse comes to worst, go to the local Police station or Hospital and ask them for help. The cops don't do counselling but they do have numbers for help lines and can refer you to someone.
When covid19 settles down and society gets back to normal, things might settle down a bit and you could look for a part time job and save some money. Then in a couple of years time you can move out and get your own place or share a house with some friends. In the mean time, just hang in there and keep fighting the good fight. Life does get better and you are approaching a better time.