I got caught perving what should I do?

today was a really hot day i was really bored in fifth period(technology) and then i saw her attractive golden tanned legs and i starred at em for about 15 seconds until she noticed i was looking at her and frowned at me then i saw her whisper to her friends while glancing at me.. im really embarrased cant even look her in the eye :$ dont get me wrng its not entire my fault im 15 and shes a really attractive girl i dunno whether i shud keep quiet abut it or apologise to her and im just wondering how bad my day is gonna be 2morrow with the word pervert written on my face