If you want to change yourself, you must first make up your mind and have strong perseverance. Tell yourself to stick to it for your own change no matter what.

First of all, I suggest you do more exercise, and you must keep exercising every day. Helping family members do housework is also exercise.

Don't be picky about food, eat more fruits and vegetables, don't smoke and drink as little as possible.

I think if a boy knows a lot of knowledge, many girls will appreciate it. I don't know what kind of knowledge you are interested in, but I prefer to read some economic and investment news or books. Boys are generally interested in electronic equipment and cars. You should also know about it. Listen to me. Reading more books and knowing more knowledge will only be good for you.

As for personality: I always thought that a person's personality would never change, but I found that I was wrong. Under the influence of my surroundings and friends around me, I have changed a little. Maybe in the future, after you step into the society, you will gradually find that some of your "personalities" or bad habits will make you lose many good opportunities. Look around at some excellent students. Maybe you despise them, maybe you think they are hypocritical, but this society is realistic. Only when you become strong will you have what you want. So form good habits, keep a positive attitude and be optimistic. I hope these words will give you some motivation.