Could you explain the meaning of " show off " expression? What does " show off girl" mean? Thank you!

Доброе утро!! :) Сегодня я проснулась от лучей солнца нежно согревающее мое лицо. Я посмотрела в окно и увидела безоблачное небо и поняла что будет прекрасный день. Я очень обрадовалась, так как последние несколько дней нас мучили сильные ветры и дожди. Я улыбнулась сварила себе кофе и включила компьютер. Хотела поделится своим хорошим настроением. Так что в это прекрасное утро дарю вам улыбку :) и желаю вам интересного и удачного дня! п.с. А если в течение дня вам будет скучно или грустно то вспомните (или представте ) мою улыбку и улыбайтесь.

Hello people around the world!! I often think how people are happy when they are born with some vivid talent. Many people determine their talents from childhood and start to develop them, whereas others try to find their ability during their whole life and some people find their talent in the end, but the others can't find any talent and ability during their life. Although I agree with the idea that each person is good at something, and everyone has talent in something but it's not fair because one get things easier than others. I understand that is life. People are born not equal.... I don't know why I wrote about this but I would like to know how you assess my ability of expressing my thoughts in English? )

First time. Introducing myself! Hello everyone! I am Ariana. My native language is Armenian. I studied English few years ago now I want to improve it. I enjoy music and good movies, I am interested in philosophy, art, talking with different people and many other things.