You can use the -ing form of a verb to give a reason by reduceingreducing a dependent clause, for example:
As he's not good at swimming, he didn't like it = Being not good at swimming, he didn't like it.
I think it's not correct toAs commented by AlanCarmack, you can omit 'being' fromthe present participle being in the participle phrase "not'Not being good at swimming".