I admire my teacher for these following reasons; he is really very/truly passionate about music and his students. I realized my weaknesses thanks to him, and then I decided to become a teacher just like him. If I Had I not met him, I wouldn’t never have been become who the person who I am now today. Admiration can be a big power strong force/power [power is not a size]. Even though I may face something hard for me challenging, I can (always) endure them and find a solutions. Respecting person shouldn’t be a teacher, but I recommend you should have a person who you respect Someone who you simply/merely respect is not necessarily going to teach you anything. Just the same, I recommend that you find a person to look up to/a person to respect . It’ll/This will support you and encourage you to achieve your goal.

Could you correct these sentences?

I admire my teacher for these reasons: he is really passionate about music and students, I realized my weakness thanks to him, and then I decided to be a teacher like him. If I had not met him, I wouldn’t have been who I am now. Admiration can be a big power. Even though I face something hard for me, I can endure them and find solutions. Respecting person shouldn’t be a teacher, but I recommend you should have a person who you respect. It’ll support and encourage you to achieve your goal.

I admire my teacher for these reasons: he is really passionate about music and students, I realized my weakness weaknesses thanks to him, and then I decided to be a teacher like him. If I had not met him, I wouldn't have been be who I am now. Admiration can be a big power. Even though I face something hard for me, I can endure them it and find solutions. Respecting person shouldn’t be a teacher, It would be better to say:
It doesn't have to be a teacher that you respect

but I recommend you should have a person who you respect. It’ll support and encourage you to achieve your goal.

Great work!!