i struggled with this and washing my face for years the thoughts of the future problems never helped what helped was realizing i didnt like it when my mouth wasnt clean it was gross and my breath smelled i didnt realize it at the time but i had given myself a good reason in the moment to get it done  with washing my face it helped to wear makeup at night i had to wash it off or it would be uncomfortable at this point years later i still use these reasons and its become much easier to just do it no more standing in the bathroom not doing anything it gets easier over time and just becomes what i do flossing is still a challenge though