When nobody else celebrates you, learn to celebrate yourself. When nobody else compliments you, then compliment yourself. It’s not up to other people to keep you encouraged. It’s up to you. Encouragement should come from the inside.
Be honest with yourself about what sparks you and take action on it. Don't worry about finding your one true "passion." That's too abstract of a concept to figure out logically. Instead, start by acting on the small things that excite you each day.