one's
The adjective form of 'self-reliance' is 'self-reliant'.
Self-communing (adjective)- Communion with one's self; focusing on one's self
Self-communing (adjective)- Communion with one's self; focusing on one's self
I am guessing you meant to write self-centered if so then yes it is an adjective
"Happy" is an adjective.
Self-explanatory is an adjective and is neither singular nor plural.
Yes, "self-esteem" is hyphenated when used as a compound adjective, such as "low self-esteem."
beautiful, self centered, worshiped, loved
He only did that out of mercenary self-interest.
Yes, "self-help" is typically hyphenated when used as an adjective before a noun. For example, "self-help book" or "self-help techniques."
self motivated and strong willed
No, myself is a pronoun, a reflexive pronoun. Reflexive pronouns 'reflect' back to the subject like a mirror. Example sentence:I changed the oil myself.Millie said, "I can dress myself, mommy."I saw the reflection of myself in the store window.