In Judges 13, Manoah's sterile wife (never named) encounters an angel of the Lord who foretells of the conception and birth of Samson. Other notable sterile-women-who-became-mothers-after-divine-intervention: Sarah, mother of Isaac; Rebekah, mother of Jacob; Hannah, mother of Samuel; Elizabeth, mother of John the Baptist.
The angel instructs Samson's parents to raise him as a Nazirite: no alcohol, no unclean food and no haircuts. A Nazirite vow was most often temporary. It was exceptional for parents to commit their child to a lifetime as a Nazirite.
Samson was a member of the Dan tribe. He grew up wandering around the yet-unconquered land they inherited. During his visits to the tribe's army camps, God stirred his heart and moved Samson along the path prepared for him. Although Samson began the journey of deliverance from the Philistines, the journey wasn't completed until the time of David.
Do you feel a stirring in your heart? Are you allowing God to use you as He intends? Your role may be to start something without ever seeing it finished. Be faithful in seeking God's will and be obedient - even if you don't see results.
We may not know how our role fits in, for now...we're all part of a much bigger story.