I Act Cold But I Have a Lot of Love and Compassion In My Heart

Me to a damn T ... Too much shit in the past has made me different, it makes me push people away or as soon as things get too hot or too close a damn wall comes up and I ice them out even though inside i have so much love to give. Sometimes I ask myself "What is wrong with me" i have issues I need to sort out internally but I don't even know where to start