Character looks super jitery while moving? (2d)

So I have been using transform.translate for my character controller (which is bad I know) and so I am attempting to switch it to rigidbody 2d.velocity right? However, whenever I do that there is some glitch where when I walk it looks like i teleport back slightly every frame.... I have tried a lot of things, like multiplying it by time.fixeddeltatime and such... nothing seems to fix it. What am I doing wrong??

public class playerController : MonoBehaviour {

 //MOVEMENT
 [Tooltip("The maximum horizontal movement speed in units per second.")]
 public float speed = 8; // movenment speed for Luca

 [Tooltip("The maximum vertical jump speed in units per second.")]
 public float jumpspd = 12; // jumo height for Luca

 private float moveInput;
 private Rigidbody2D rb;

 
 public Transform groundCheck;
 public float checkRadius;
 public LayerMask whatIsGround;

 //ANIMATION
 public Animator anim;
 bool canDash = true;
 private bool grounded;
 bool isRunning;
 public SpriteRenderer ren;

 //UNUSED AS OF NOW
 public static float LucaHP;
 public static float LucaSP;
   

 //TODO: MOVE ONTO NEW SCRIPT
   




 // Use this for initialization
 void Start()
 {

     anim = gameObject.GetComponent<Animator>();
     anim.SetBool("isRunning", false);
     anim.SetBool("dashing", false);
     anim.SetBool("isJumping", false);
    

     canDash = true;

     rb = GetComponent<Rigidbody2D>();
 }

 // Update is called once per frame

 void Update()
 {
     HandleDash();
     HandleFlip();
     HandleJump();
     anim.SetBool("isRunning", isRunning);
     if (Input.GetButton("Horizontal"))
     {
         isRunning = true;

     }
     else
     {
         isRunning = false;
     }
     

     if (grounded == true)
     {
         anim.SetBool("isJumping", false);
     }
     
 }

 void FixedUpdate()
 {
     playermove();
     
 }






 void playermove()
 {
     grounded = Physics2D.OverlapCircle(groundCheck.position, checkRadius, whatIsGround);


    
     float axixX = Input.GetAxis("Horizontal");
     //transform.Translate(new Vector2(axixX, 0) * Time.deltaTime * speed);

     rb.velocity = new Vector2(axixX * speed * Time.fixedUnscaledDeltaTime, rb.velocity.y);

     
 }