British world road cycling champion Lizzie Armitstead believes people will "forever" doubt if she is a clean athlete after missing three drug tests.
The 27-year-old was suspended and faced missing the Olympics before the first test was declared void.
Speaking before Sunday's road race, a tearful Armitstead told BBC Sport she would "never cheat in life".
"In this situation I'm never going to win. If I win, people will say it's because of something else," she added.