Your girlfriend keeps saying that you don't take the initiative. This is one of your great shortcomings. You are shy. This is your personal character. So since he brought it up, you must improve it.

However, a leopard cannot change his spots, so even in order to improve you, you must have strong perseverance, which means that you are naturally shy, so you should contact more people at ordinary times and then talk more. In fact, it will change your shy state after a long time.

Give yourself a little confidence and make yourself feel particularly valuable. So don't be shy when you meet anyone, but feel that it is normal to talk and do things with them. Don't blush when you say anything, that won't do.