when i talking with someone or pronounce some words i felt i have mouth sore?!

Hello everyone in Philippines

i have a problem when i talking with someone and pronouncing words they telling me that when i talk and pronounced with a words im having a mouth sore(singaw kapag nakikipag-usap) Sometimes I'm ashamed to speak because they say im talking with mouth sore (minsan nahihiya na ako kasi sinasabi nila na singaw daw po ako makipag-usap)

i want to solve my problem and make myself good in pronouncing and not getting ashamed to everyone when i talking...

also i want to know if there have a doctor who making a treatment to make everyone sounds good,clearly in pronouncing a words?or talking with someone?...because i heard to my professor that he have a treatment in his tongue to make his pronounced good and amazing hes a filipino but he talking like a foreigner accent but they have a also an accent of filipino