is soy milk a problem?

Hi.
I have always read that soy milk is always better than cow's milk.
I am trying soy milk because I am trying to be a vegan.

However,here are some things I heard about soy milk(negative things):

1.Calcium levels in soy milk are low and we must buy only calcium fortified milk for a good calcium intake.Now,does this calcium fortified soy milk cost any more than normal soy milk?
What are the packets supposed to read?I can only find ,"Soy Milk" here.

2.Soy milk contains phytochemicals which prevent absorption of zinc and other minerals,thus leading lesser development(especially for people who are growing) and also
can be cancer causing.They also increase estrogen levels.

Please look here:
Health Dimensions - Soy - Good or Bad?
The Dark Side of Soy

Me aside,can a 17 year old boy continue drinking soy milk?

Does someone know about all this?I couldn't get a good and true opinion from anyone here,can you help me out?

Thank You