I used to get into a lot of defensive arguments with evangelicals about my “radical” decision to become Catholic–(believe me, I rocked the boat quite a bit in my circle of friends when I converted–I had been in full time Christian ministry and an evangelical for 27 years before converting to Catholicism at age 44). What I found was that most of them didn’t care a whole lot about my own experience, or my own story. They argued using a lot of cut and paste apologetics which they thought should win the debate. I found myself responding to them in kind, with my own cut and paste Catholicisms…never very effective, quite frankly. None of what they said kept me from converting, and thus far, no one has joined me in crossing the Tiber…( "The heart has its reasons, "etc etc)
Leaving evangelical Christianity for Catholicism can be an extremely difficult journey and its definitely not for wimps! It took me probably 12 years for God to dismantle my evangelical way of looking at things and to bring me into the fullness of faith which is the Catholic Church. It was extremely painful, and continues to be painful, with regard to the relationships it affected.
In light of my own experience, I suggest that you try to put a postitive spin on the negative reactions by considering that your friends and family care enough about you to keep you from making a decision which they consider to be detrimental to your spiritual health…after all, for many of them Catholicism is a form of idolatry–and certainly not “Christ-centered”–so of course they are concerned for you. Try to look at it in that way. Be thankful that you have people in your life who care about you that much. And trust that God is working in their lives also–even if that means that they are not going to become Catholic!! They still have an experience of God which should be respected, and their stories should be heard, not silenced…God bless you on your journey…