A religiously committed young man proposed to her, but she does not like him

I am a sixteen-year-old girl. A religiously committed young man has proposed marriage to me; he is a mu’adhdhin in one of the mosques. But I do not want to marry him, because I do not like him; rather I disliked him before he proposed to me. Am I sinning if I say no and reject his proposal, when he is pleasing in terms of his religious commitment?

Praise be to Allah, and blessings and peace be upon the Messenger of Allah:

If you do not want to marry someone, there is no sin on you, even if he is righteous, because marriage is based on choosing a righteous spouse with whom you feel at ease, unless you dislike him because of his religious commitment, in which case you are sinning in the sense that you dislike a believer, because the believer should be liked for the sake of Allah, and in the sense that you dislike his adherence to his religion. But even if you like him as a fellow believer, you do not have to marry him so long as you do not feel comfortable with him.

And Allah knows best.

Al-Muntaqa min Fataawa ash-Shaykh Saalih al-Fawzaan (3/159)