Tassy grew up in St Ives and had started surfing by the age of seven. Her family, school and college all supported her ambition to surf professionally. Tassy progressed to become a highly talented surfer and represented Great Britain. She has competed in five World Junior Surfing Games at locations around the world, including France, Ecuador, New Zealand, Peru and Panama. Between the ages of 15 and 18, Tassy also won every British, English and UK under-18s Pro Tour title.