Truth can be proven and is not arbitrary. Feelings and opinion are arbitrary and can't be proven, so therefore they can't be truth. Personally, I find it to be very monotonous and a waste of time to deconstruct a concept as basic as "truth," which any adult with common sense knows what it is.
ironically, i feel that most adults have a
feeling what truth is, but don't actually know the truth of truth. and luckily for you, i find it incredibly valuable to deconstruct concept as basic as truth, because rarely do we think about basic things meaningfully.
as for truths being provable, there are examples where truths cannot be provable (by logic, if i can infer your meaning of 'prove') and feelings can be rather truthful. it is true that 2+2=4, but i feel most (non-mathematical types) cannot
really say why 2 and 2 make 4. we've been taught it all our life. a lot of us possess an intuitive grasp on why 2 and 2 is 4. but, like i said, there isn't a really robust and persuasive way (seeing as most people lack degrees in advanced mathematics) to prove the fact.
as for feelings being truthful, suppose someone is walking alone at night in deep and dark forest. if they tell us after the fact that they were scared, we'd interpret that as being as a true statement, as most of us can relate to the fact that walking alone at night in a deep and dark forest is a pretty damn scary thing to do.
this is why i ask you to elaborate on your feelings of the word 'truth'. you cannot simply just handwave away any objections to something as philosophically profound as "opinions or feelings are not truth"; you simply have to provide a robust and persuasive justification for the statement. otherwise, as i mentioned at the beginning, you're violating your own statement.