Actionscript 3 slingshot throw not working

Hi! I am quite new to as3 and i am trying to figure out how to make an object to appear like it's being catapulted from a slingshot.

Here is the code I've done so far. The problem is, my objects starts moving from the start and not only when it is released... How can I make it move like it's being thrown when I release the mouse?

stop();

import flash.display.Sprite;

import flash.events.Event;

import flash.events.MouseEvent;

import flash.display.Shape;

import flash.display.MovieClip;

import flash.sensors.Accelerometer;

import flash.events.AccelerometerEvent;

var bird1Start: Object = (bird1.x , bird1.y);

var bird2Start: Object = (bird2.x , bird2.y);

var bird3Start: Object = (bird3.x , bird3.y);

var gravity = 0.1;

var angle1: Number = 0;

var angle2: Number = 0;

var radius: Number = 1;

var elasticCoefficient: Number = 0.0015;

var released : Boolean = true;

var forced: Boolean = false; //weather or not it is being pulled down between sticks

var accX: Number =0;

var accY: Number = 0;

var velX: Number =0;

var velY: Number =0;

var level : Number =1;

lvl.text = String (level);

var hitwood1: Boolean = false;

var hitwood2: Boolean = false;

var hitwood3: Boolean = false;

var hitwood4: Boolean = false;

var hitwood5: Boolean = false;

var hitwood6: Boolean = false;

var elastic:MovieClip = new MovieClip();

addChild(elastic);

function resetPlay(){

velX = 0;

velY = 0;

accX =0;

accY = gravity;

forced = false;

bird1.x = bird1Start.x;

bird1.y = bird1Start.y;

bird2.x = bird2Start.x;

bird2.y = bird2Start.y;

bird3.x = bird3Start.x;

bird3.y = bird3Start.y;

}

bird1.addEventListener (MouseEvent.MOUSE_DOWN, bird1clicked)

function bird1clicked(event:MouseEvent){

bird1.startDrag();

released= false;

}

bird1.addEventListener (MouseEvent.MOUSE_UP, bird1released)

function bird1released(event:MouseEvent){

bird1.stopDrag();

released = true;

}

addEventListener (Event.ENTER_FRAME, doConstantly);

function doConstantly(event:Event): void {

// if i take this statement out, the object moves only dragged by mouse, it's not thrown

if (released){

bird1.x+=velX;

bird1.y+=velY;

bird1.rotation+= velX;

}

// drawing elastic

elastic.graphics.clear();

elastic.graphics.lineStyle(1, 0x000000);

if(bird1.x<point2.x){ //if the bird is on the left side of the slingshot

forced = true;

var x1:Number =bird1.x -point1.x;

var y1:Number =bird1.y -point1.y;

var x2:Number =point2.x - bird1.x;

var y2:Number =point2.y - bird1.y;

var distance1: Number = Math.sqrt(x1*x1+y1*y1);

var distance2: Number = Math.sqrt(x2*x2+y2*y2);

angle1= Math.atan2(y1,x1);

angle2= Math.atan2(y2,x2);

var xOffset: Number = Math.cos (angle1+Math.PI/2)*radius;

var yOffset: Number = Math.sin (angle1+Math.PI/2)*radius;

var xOffset2: Number = Math.cos (angle2+Math.PI/2)*radius;

var yOffset2: Number = Math.sin (angle2+Math.PI/2)*radius;

angle1 += Math.sin(radius/distance1);

angle2 += Math.sin(radius/distance2)*-1;

elastic.graphics.moveTo(point1.x, point1.y);

elastic.graphics.lineTo(bird1.x+5, bird1.y+20);

elastic.graphics.moveTo(point2.x, point2.y);

elastic.graphics.lineTo(bird1.x+5, bird1.y+20);

} else { //the bird is on the right side of the slingshot

forced = false;

elastic.graphics.moveTo(point1.x, point1.y);

elastic.graphics.lineTo(point2.x, point2.y);

}

if (released === true&& forced === true){

accX+= distance1*Math.sin(angle2)*elasticCoefficient;

accY+= -distance1*Math.cos(angle1)*elasticCoefficient;

accX+= distance2*Math.sin(angle1)*elasticCoefficient;

accY+= -distance2*Math.cos(angle2)*elasticCoefficient;

}

if (released){

velX += accX;

velX+=accY;

   }

}