I know this decision is difficult, I just had to make it myself (surgery is scheduled for 9/9). You are young and I know that makes it even more difficult. Fear is so natural...we are only human. I don't know your religious beliefs, but I found that prayer has helped me a great deal, you need to turn it over to God. I really like this verse:
"Surely God is my salvation; I will trust and not be afraid. The Lord, the Lord is my strength and my song; he has become my salvation." (Isaiah 12:2)
and this one:
"I sought the Lord, and he answered me, and delivered me from all my fears." (Psalm 34:4)
This site is so wonderful to be able to talk to all these wonderful folks who have been through this before. Just keep posting your concerns and you will keep through.
Hang in there.
Lori