I really like this girl but im too scared to ask her out?

Alright there is this girl at work i really like. But i lack confidence and i am quite a bit overweight and got some mental health issues. Because of this im not sure what she would think of me. I am trying to lose some weight im currently 5'8 and 230 pounds. How do i ask her out?
I really like this girl but im too scared to ask her out?
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