From reading the post, I think you need to expand your life beyond studying. Do you have any interests or hobbies? Do you travel, Do you read any books other than study books? Do you play any sports, watch any movies? What do you do for fun? all these life activities makes up the whole person of who you are.
If you don't do any thing for fun, you can't relate to other people about what they do for fun. If the only thing that you can converse intelligently about is your study then no wonder you always run out of thing to talk about. If you have not got any thing that interesting to talk about, what about asking people what interest them and then show genuine interest in what they tell you. May be you can pick up on what you need to do to slowly build up your new persona.
One of my friends used to be so timid, and then she made the point of trying to be more sociable. She changed her dressing style not so much to be more fashionable, but brighter, funkier and more fun. She joined up with the fun girls at work for lunch. Because it always is in a group, she often did not have to say much but just listen and make the occasional comments. Because she is such a lovely and friendly person, nobody mind having her around. After a while she becomes part of the whole group, she talk what we talk and sometimes we can't even shut her up.
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