Im starting to feel suicidal. I'm 18

I feel like killing myself, I lost 3 jobs in the span of a year, one of them helped me alot, I'm homeless I'm 18 and getting another job is hard when no ones hiring. I'm just homless and broke, my mom sneaks me over but I can't sleep inside, I just feel like I'm a failure, I told my mom about my feelings and she said she's gonna call crisis on me, Im all alone, and everything is just getting worse I don't have a high schoold education or GED, so it's not like I can get a good job and the GED is so hard, I've been trying to pass it for 3 years. I'm losing all my hope. I'm really having a crisis. Like it's starting to become unbearable to be awake, I've never been this depressed.