Talking about grammatical mistakes

Good morning. I'm very glad to introduce myself to you here. I hope I can do well today. I believe I can succeed. Now I will introduce myself, Bree Fly. My name is Xiao, and I am twenty-five years old. I graduated from Liaoning University in June this year, majoring in environmental science. Now, I am trying my best to get a key to Tianjin University. I am a straightforward person and a diligent student. I like reading books and playing basketball in my spare time. Besides, I participated in various beneficial activities and won many scholarships. If you can give me a chance to study in this famous university, I will try my best to master this language and improve my ability. If possible, I will continue to study for a doctorate. That's all. Thank you!