The first point is to start with our own appearance and dressing style. As a man, you must be careful not to leave your hair too long and not to dye some bright non-mainstream hair colors. Be sure to do a basic face wash and skin care, and don't leave nails. Some small details will greatly affect girls' judgment of you. Then there is the style of dress. Girls who don't wear tight leggings and bean shoes will be disgusted. To cater to the current mainstream, you can wear some loose jeans with a pair of canvas shoes. An oversize sweater on your upper body will make you look sunny, big boy.
The second point is the way of speaking, which I personally think is the most important. As a boy, you shouldn't haggle with girls. You should tolerate girls without violating your own principles. When dating together, boys can spend a lot of money to win the favor of girls.
The third point is that you should exercise more and get in good shape. Of course, girls won't call you a weak chicken.
Share a boy's clothes here. If it works, you can have a look.