I am kinda considering taking the pledge but it is a big ting to do so can i have some information and the pros and cons? and how do I tell my paretns?????

well i would suggest sit your parents down and talk to them about it. i'm sure they would be happy taht you are sharing this info with them.
as for pros and cons they can go on forever.
pro: you are 100% safe from STDs, pregnancy.
in a way for your future spouse, you are giving him a gift ( in a way)
cons: exposed to STDs.

there is much more but too much to list them all. i would suggest getting a confidante so you could talk to them.
i would also suggest checking out thsi workshop called no apologies which could give you a better idea.