I am so sorry you are going through this. I'm not sure how the WT study went in your congregation but in ours, there were more than a few elders and older ones stressing that baptism is a personal decision and should not be done for anyone else but yourself. Not because of peer pressure from parents, siblings or other jw youths.
Can you change what you said to your parents a little and tell them something like, you been thinking about the WT article and that you take this seriously and want to make sure you are doing it for the right reasons? Maybe admit that you said yes to their question about baptism because you really care about how they view you and that shouldn't be the only reason. Maybe say you do eventually want to get baptized but feel you need to make sure your making a mature decision on your own. Or say something similar to buy yourself more time.
The article surprisingly gave some flexibility in deciding to get baptized, as well as preparing to get baptized. All of this takes time. It moreso emphasized and stressed that it is the youth's decision. I understand that parents might use this to pressure their children.
My children were also being pressured to baptized and I told them the same. That it is their personal decision that they would have to live with so they should not do it because of pressure from other family.
I think it may help if you do not say for certain that you dont want to get baptized, just not right this moment...and keep pushing it off without saying you dont plan doing it. Express that you love Jah and that you just need time to figure things out before taking that major step. Try not to give too many details but just enough to make the point.
