no you're not a lesbian but you admire this other girl so much you feel excited, nervous, even sweaty around her!
yup according to what i read somewhere this usually happens to females in their 20s and 30s. explains what i see in a friend who seems to like another girl so much but said it's just an emotional thing, nothing sexual. so i guess the closest i can come up to to describe this phenomenon is 'girl crush'.
naka experience na mo ani mga girls?
(and guys also experience boy crushes but they are not open about it.)