It could be a lymphocele. It is not a cause for panic, and certainly not for suicide.
https://www.nhs.uk/common-health-questions/mens-health/what-is-this-lump-on-my-penis/
https://www.healthline.com/health/mens-health/lump-on-penis#lymphoceles
It happens when the lymph channels are temporarily blocked after sex or masturbation. It should resolve soon. It may last for several months, but just get it checked my your doctor to make sure it's not anything else, but there is no reason to panic.
Please help me, I'm having suicidal thoughts because of this.