Hi, there might be various factors of environment, thoughts and biological that are affecting you. As we many times can't change the environment so we change the way we think or our biological by medical intervention. You can see a psychiatrist first as you are feeling suicidal. Then an intervention of CBT would be very helpful.
Next Steps
See a psychiatrist
Health Tips
Taking help fast is very useful. In many cases medicines are short term and no need to worry.