Just a few years ago I was in your shoes.
I come from a strongly rooted Baptist family. Infact on both my father’s and mother’s family line there are Baptist preachers, including my Grandfather.
My journey to Catholicism was not an easy one. I fought it freverntly. It actually took me almost five years of question, study, and prayer before I finally made my decision.
All in all they are supportive, but none of them agree. It did take them awhile to grasp it though. At first there were heated arguments, after which we decided to make a point not to discuss such things. (Although I slip things in here and there when the time is right.) One of the reasons I personally think the conversations get so heated is eventually, I would get them to a question that they had no answer for. As a baptist growing up, i was very aware of my beliefs and the theology. As a Catholic I would say I am even more so, infact thats why I am one today.
That is the first part of my advice. Be deeply rooted in your faith, and KNOW the reaaons and the real meanings behind the church’s teachings.
The second peice of advice I can give you is to do your best not to let them make you angry by attacking your faith, this will lead to nothing. Pray for calmness and a clear mind if you are ever in these situations.
The third peice of advice is to be honest. As I am sure you are aware, some things in Catholicism can be quite shocking to a protestant person. Especially one who cares about you. When they ask you questions be honest. Don’t apologize for your beliefs, be proud of them.
The fourth and final peice of advice is prayer. Pray for your family and yourself. In time I am sure most if not all of them will accept your choice and hopefully you may even pull a few of them over with you
These types of situations are never easy but, I don’t think it will be as bad as you are worried about. My experience was not as bad as I had feared. Ask your family to come, tell them how much it would mean to you. If they do not come, don’t hold hostile feeling toward them. My grandmother could not bring herself to come, but she did give me a card to congratulate my baptism. It may not seem like much but it was big step for her.
My thoughts and prayers are with you. I open my arms to you in fellowship, and congratulate you on what I am sure was not an easy journey.
Welcome to the church my friend. May God bless you.