I m not a conversationalist .all my boyfriends found me boring to talk to.how can

Well, talking about what your guy does or how he looks or how he makes you feel are all safe subjects. You are hinting that you are self-conscience and that could be your stumbling block.

Find out what your man is really in to and do some research on the subject so when that subject comes up you'll be able to follow the conversation and perhaps even add your 2¢.

Talking about yourself can be risky unless you talk about your feelings. Let your man know how you feel and maybe he'll understand.

J.R.

First you must enjoy yourself, get happy and let go of these concerns. When you are feeling better in general you may go back to thinking about conversation but rather then see the reality you just explained see yourself engaged in delicious conversation, notice how everyone is enjoying it. If you again notice you are thinking ever that people do not enjoy your conversation just stop thinking. I find it easiest to interrupt negative thought by listening to the note of ohm in my head. You don't have to finish a negative thought and I believe that if you do this long enough and with enough self love you will find the new truth, people love talking to you!

OP: sAeGe makes an EXCELLENT point here!!

Perhaps if you can learn to see yourself as an 'equal' to the guy, rather than subordinate, the converstations might flow easier and more interesting.
And I don't mean concentrate your efforts into making 'him' see you this way, I mean work on making yourself see that this is true.
It will come across to him. Believe this.