Self conscious.. helpp

now when i met a really great guy i am scared to go out with him because my self confidence is so low lately i hate iit... and he really wants to go out with me as it seems.. but i cant see why bc im so ugly ... and idk what to do ... every time we see each other i cant help but womder is he on any drugs or something to like me.. and that eventually he will see me as i see myself and just leave.