Lineage change possibility

I formerly practiced with the local Shambhala group. I took my Refuge Vows there, received some random Buddhist name that had nothing to do with my studies or who I am; and was told I was now a member of Chogyam Trungpa's lineage. Since then I found out about the disgusting sexual and physical abuse perpetrated by Chogyam Trungpa and his son, the current Sakyong, and have not been able to continue with the Shambhala teachings. My question (and I apologize for its being so very basic) is: can a refugee somehow change lineages? I asked this of an older woman there whom I respected,and she said no without any explanation. I now am studying the teachings of H.H. the Dalai Lama, and do not really know what tradition I am in. I have practiced on my own -- with the exception of my few Shambhala years -- for about 20 years, but am not very knowledgeable about the scriptures. Any link to a good beginner's guide would be much appreciated. I hope I have not violated any rules. And thanks in advance for any answers. I really don't want to be associated with Shambhala in any way. If there is a way to change my lineage, I'd really like to know.