The Highlander & His Lady (The Highlanders #1) by Lisa Samson

A somber revelation on her 16th birthday brings Jenny Matheson's carefully protected life in the Scottish highlands crashing down around her, as she learns the truth about who she really is. When she meets Kyle Maclachlan, Jenny knows she has found a kindred spirit, a man to share her life. But Kyle's destiny is to rule the clan Maclachlan and Jenny's past clouds her hopes of joining him.