I think you should wait until you feel better about yourself because it seems you have low self esteem and when you go into a relationship feeling lucky to have that person it sets the power balance too far in their favour you should know you are good enough for anyone
Plus if you ask someone out expecting them to reject you they probably will not because you are not attractive but because they will get the wrong signals from you, go up full of confidence and your attractiveness instantly goes up
Don't be scared of rejection just think if they say no they are leaving the path open for the man who reall really wants to be with you, you deserve no less
I say this as a five foot ten size sixteen to eighteen who has had no problems attracting men despite being told men like petite skinny girls
Good luck!