If you have TX, then you may well have a genetic disorder called Familial Hypercholesterolemia, or inherited high cholesterol. If you have TX and do not have FH, then you may have another lipid metabolism or storage disorder which would be much more rare.
Chances are you have Heterozygous Familial Hypercholesterolemia, a disorder that causes elevations in total cholesterol and LDL cholesterol affecting approximately 1 per 500 persons worldwide. In Heterozygous FH, you inherit one copy of the FH gene and usually show symptoms between 30 and 50 years of age. In Homozygous FH, you inherit two copies of the FH gene and may show symptoms in the first decade of life. Homozygous FH is much more rare, affecting only 1 in a million people. Victims of Homozygous FH have severely elevated blood cholesterol levels and may not live beyond the second decade of life.