Maybe your girlfriend wants you to become stronger, because it will make her feel more secure, but not every man can grow as tall and powerful as he wishes, so you don't need to feel inferior, because her expectation is human nature, but she really can't see the gap in reality. Just like a boy feels that his girlfriend is not as beautiful as other women, so my advice to you is to use your love and care to eliminate her psychological anxiety, which will not only make your feelings stronger, but also make each other move.