"If—" is a poem about the transition into adulthood and the personal qualities that, as Kipling understands it, make for a mature and functioning human being. At its core, this poem is didactic in its tone and intentions—this is a poem which strives to provide a lesson, and in it, Kipling gives advice as to the qualities that ought to be cultivated in adulthood.
There is a great amount of self-confidence and conviction on the part of the speaker concerning the advice being given. There is little room here for doubt or equivocation. Even if the speaker phrases his advice as a series of conditional statements, there is nothing conditional about the advice itself: for Kipling, these are the qualities required for achieving self-actualization in adulthood.