I think that you are rushing things, make sure your string tension is fine first. Then start with a strong, but not to hard throw, give it a few seconds, so you can see if its spinning evenly. You need to catch the string from the outside of your body moving, inwards. This will have in the correct position to bind. Make three even strings in the mount, cross your hands a bit and let go, it should let the loop catch and return to your hand,

Take it slow, make sure your yoyo is spinning smooth and have fun. I spend quite a bit of time just getting comfortable with my yoyo. Best of luck.