I -- The pronoun "I" is used here. Since, as the subject of the sentence, it is part of the verb, its explicit use accentuates who is speaking "I." Saying "I myself" captures this feeling in English.

missing "myself" -- (MW)  The subjective pronoun repeats the information in the verb so it should be repeated in English like "I myself."

am -- The verb "am" here is the common form of "to be" in Greek. It means to have a certain characteristic or remain in a certain condition. It also equates terms or assigns characteristics.

the  -- The word translated as "the" is the Greek definite article, without a noun, it has the sense of "the one." The Greek article is much closer to our demonstrative pronouns ("this," "that," "these," "those") than the English "the." See this article for more. 

door: -- The word translated as "the door" means "door," "valve," "gate," "window shutter," "a frame of planks," [in war}"fence or similar obstruction," "entrance" and, metaphorically, "entrance to the soul." This term for "door," is used by Jesus only here in the synoptic Gospels, but which is used in John more frequently by Jesus referring to himself as "the door" to salvation.

by -  The preposition translated as "by" means with the genitive "through," "in the midst of," or "by (a cause)." It indicates movement through a place or time, but it also means "by" the sense of "by means of" a given method.

me -- "Me" is the first-person possessive singular pronoun. This pronoun follows the noun so "of mine."  As a genitive object of a preposition, as here, it means movement away from something or a position away from something else.

if -- (CW) The Greek word meaning "when" indicates more of an expectation of something happening than "if" alone. This is how we use the word "when." This is not the simple "if.

any -- The Greek word translated as "any" in the singular means "anyone," "someone,"  "something," and "anything." In the plural, it means "some," "they," and "those." Jesus often uses it to start a question so it means "who," "what," or even "why."

man -- (IW) There is  nothing in the Greek that can be translated as "man" in the Greek source. The pronoun above is eiher masculine or feminine.

enter  -- "Enter" is a word that means "go or come into" and has the double meaning of "coming into one's mind."

in,  - (IW) This is from the prefix of the verb, but it is a bint redundant since "enter"means "go in."

he -- This is from the third-person, singular form of the verb.

shall -- This helping verb "shall" indicates that the verb is the future tense. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

be -- This helping verb "be" indicates that the verb is passive. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

saved, -- "Saved" is the Greek word that means "to keep alive" when applied to people or "to keep safe" when applied to things. Jesus uses it to mean "rescue" in most cases.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

shall -- This helping verb "shall" indicates that the verb is the future tense. Helping or auxiliary verbs are needed to translate the Greek verb forms into English.

go -- (CW) "Go" is a word that means "go or come into" and has the double meaning of "coming into one's mind." However, it was just translated as "enter" above, so translating it differently here makes it look like a different word.

in - This is from the prefix of the verb.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

out, -- (CW) The word translated as "out" means literally "to go or come out," but it has a secondary meaning of "making something come true." It is best translated as "exit." The "out" is from the prefix.

and -- The Greek word translated as "and" is used as the conjunction "and," but it also is used to add emphasis ("also"). In a series, it is can be translated as "not only...but also." After words implying sameness "as."

find -- The term used for "find" is the source of our word, "heuristic," meaning enabling a person to find out something for themselves. It means "find out" and "discover."

pasture. - The noun translated as "pasture" doesn't mean that exactly. It means the food from the pasture like "forage" and the process of eating it like "foraging." Its metaphorical meaning is to "spread out." This refers to how a herd of animals spreads out when they are eating as opposed to how they bunch together when moving or defending themselves. Jesus onlu uses this word three times.