How can i give a good bj:/?

You sound like a good girlfriend btw. Just don't get a piercing. That could ruin it. My gf has trouble taking it all in also. A good thing to do is to make sure you use your hands also as an extension of your mouth. Just move it up and down with you mouth so you will be basically giving him an hj on the shaft and a bj on the head. Sucking and licking the also feels pretty damn good :-)