Should i ask my big love?...or am i an idiot?

Hallo everyone. I am from Germany please excuse my english as it is not very good! ...I had painful divorce four years ago and i am now beginning to seek happy life again.i want to ask you for advice on love.For 8 months now i have become to know an irish woman who is a teacher that moved here to germany for work. she is funny kind beautiful and very down to earth and she always makes big smile on my face.i want to have relationship with her but i am very afraid she will say no because she has bigger standard of life than me i am only working in a restaurant and i am not the best looking guy either and i also dont think i am good enough for this woman .i care so much for her and i want her to have a beautiful life.I have tryed in the past to ask her out but i always make an idiot of myself or doing something very stupid which makes me very embarrassed .it makes me mad that i care so much for her and can not express it to her because whenever she is around i begin to shake which is so frustrating .i need advice or help i can not get this woman out of my head with the last few months she is making me crazy !! if you can help me please i would be grateful Danke allen Hans x