Syntax: "Although" introduces a concessive clause, contrasting the previous state (loneliness) with the current action (leaving life in your hands). "Has always been" uses present perfect tense to describe a continuous state from past to present.
Morphology: "Loneliness" is an abstract noun derived from the adjective "lonely." "Leaving" is the present participle form of "leave," indicating an ongoing action. "Your" is a possessive determiner.

Syntax: "People say" introduces reported speech. "That I am blind" is a subordinate clause functioning as a complement. "Risking it all in a glance" is a participial phrase describing the manner of the action.
Morphology: "Crazy" and "blind" are adjectives. "Risking" is the present participle of "risk." "Glance" is a singular noun.

Syntax: "How you got me blind" is a nominal clause acting as the subject of "is." "Is still a mystery" uses a linking verb with a predicate noun. "I can't get you out of my head" is a simple declarative sentence with a negative modal verb (can't).
Morphology: "Got" is the simple past form of "get." "Blind" is used as an adjective complement. "Mystery" is a noun. "Can't" is a contraction of "cannot."

Syntax: This is a series of noun clauses introduced by interrogative pronouns (who, where, what) acting as objects of the verb "care." "As long as" introduces a conditional clause stating the sole requirement.
Morphology: "Don't care" uses the auxiliary "do" in negative form. "Who," "where," and "what" are interrogative pronouns. "Love" is a base form verb in the subordinate clause.

Syntax: "That you have said and done" is a relative clause modifying "thing." "Feels like" introduces a subjective complement clause. "Doesn't really matter if" introduces a conditional clause where the condition is unimportant.
Morphology: "Said" and "done" are past participles. "Deep" is an adjective. "Meant" is the past participle of "mean," used here in a passive sense ("are meant"). "To be" is the infinitive.