Can I get a buy to let mortgage and live in the property myself?

It would definitely be considered wrong to apply for a buy to let mortgage if you plan to live in the property yourself. It might even be considered mortgage fraud for which the penalties are severe if caught.

If you are having trouble applying for a standard residential mortgage and proving your income, it may be worth considering using the services of a qualified accountant. By preparing your books and getting help to prove your income you will be in a stronger position when applying for a home-owner mortgage.