How do i get over my EXTREME fear of spiders?

so im 15, and i only have 2 true fears. the first is suffering from pain, and the 2nd is bugs. ESPECIALLY spiders! i hate everything about them. the sight of one makes me scream and i cringe n shake when i see them crawl. i think theyre one of the most disgusting thing on this earth. just talking about them makes me want to puke! my fear got worse after one crawled over my face twice when i was asleep, (which my mom did nothig about) and ever since them my fear has only become worse. i will always hate them with all my heart, but does anyone know a way i could become less afraid of them? i cant even kill one by myself. i just scream until someone else does it for me! im ridiculously scared of them its not even fathomable, soo any ideas on how to become less afraidd?!?!?!?!?