Age difference is stopping me to love her. Help :(?

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I met a girl at my brothers girlfriend birthdayparty (She is the niece of her)
So my brother and her knows the girl.
I didnt had a eye on her that day but she had one on me.
We just were talking and she kept looking at me <3

After i got home she added me on facebook
She looked like 15 but she is 13 in a week.
Im 16 in november so she is 3 years younger

So we chatted A LOTTTT
I said that i love her but im worried about her parents
We didnt stop to chat , she understanded that.

She is the first girl that came in my life
I didnt care about girls then.

My brother doesnt agree i go with her just of the age gap.
She said she loves me and she always asks things about me to others
Her niece says thats its not a big problem. Its just her parents.
I never had a gf , and IM NOT DOING SEX.
Im not that type of guy if you understand me.

But i said i think every sec about her. So what im about to say that im gonna break if she finds another boyfriend because i wait TOO MUCH.

She does look younger but like 1 year or something
She is not like the other 13 year old girls.

Thanks for reading my story
Any advice ?