Is it possible to give yourself a life threatening infection or illness or damage your cervix when inserting fingers to masturbate?

Damage by masturbati. It is not likely to cause infection by masturbation. You should be sure to be clean and gentle with yourself.
No. Masturbation is a normal activity for both men and women of all ages. Similar to putting your fingers in your mouth, no real danger of causing any damage to cervix or giving yourself an infection. As with all activities, start with clean hands.