Worried about pre employment background checks ?

With regards to employment history on two occasions the organisations I worked in I just left without explanation, I know its bad but they was not actually proper jobs all on a voluntary basis I was not paid or anything, so I could leave out my own accord as many others did . Is this something I should worry about... show more With regards to employment history on two occasions the organisations I worked in I just left without explanation, I know its bad but they was not actually proper jobs all on a voluntary basis I was not paid or anything, so I could leave out my own accord as many others did . Is this something I should worry about or am I overthinking
Update: im in the UK btw
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