With the verb "feel" we only use boring. But we use "boring" , when we are the cause of the boring OR anything is the cause of the boring, who is doing the action. ←Here we say He is boring. But when u r the thing, who receives the action; we say I am bored. OR He is bored. For example, there is a movie is showing now.And it is not interesting. The thing which causes the action is the movie, so u will say "the movie is boring " ...The thing which receives the action is -for example- U, so u will say " I am bored" I hope u understand me◇.

U can say directly "I am 15 years old"☆

u will say it is thirty five past three.

Both of them. And u can change it from the settings.

are

Because the 1st&2nd persons have "do & don't "

sure ◇

sure . How can I help you ?✿

yep

(are you) is for Yes OR No question. ( you are) is for a sentence. (do you) is for wh questions. with my best wishes... ☆