Array length wont become updated,My array length is zero and wont change

my array has a length of zero even though length is set to 20 and I update segment pose in the start function.

 public class Tentacle : MonoBehaviour
 {
    public int length = 20;
    public LineRenderer lineRend;
    public Vector3[] segmentPose;
    public Transform targetDir;
    public float targetDist;
    private Vector3[] segment5;
    public float smoothSpeed;
 
 
    private void start()
    {
        lineRend.positionCount = length;
        segmentPose = new Vector3[length];
        segment5 = new Vector3[length];
    }
 
     // Update is called once per frame
     private void Update()
     {
         Debug.Log(segmentPose.Length);
         segmentPose[0] = targetDir.position;
         for (int i = 1; i < segmentPose.Length; i++)
         {
             segmentPose[i] = Vector3.SmoothDamp(segmentPose[i], segmentPose[i-1] + targetDir.right * targetDist, ref segment5[i], smoothSpeed);
             
         }   
         lineRend.SetPositions(segmentPose);
         
     }
 }

debug says it still has 0 length ,My array length is stuck at zero and wont change, what am I doing wrong my length int is set 20

segmentPose = new Vector3[length]; this code is in my start function