My church is very old fashion and i need a good song to sing in church please help?

I am a boy
im seventeen
and can sing almost anything

Are you looking for something for Christmas or just any Sunday? I need more information such as the denomination of your church and the occasion that you are singing for. Is it an anthem, offeratory, special service or what exactly.

I checked back to see if you added any additional info. Since you didn't I'm going to suggest the following
"O Holy Night" for Christmas, if you have the range and
"How Great Thou Art" for whatever. Those are my two favorites for hearing a male soloist.

so are you saying you can only sing traditional hymns or something more contemporary? need more info....

kumbaya lol.

Amazing Grace is always a good choice

what about Grace Like Rain

For Christmas try Gabriel's Message (The Angel Gabriel) or Adeste Fideles (O Come All Ye Faithful), for others try "How Great Thou Art" or "Jesu Lover Of My Soul" for example.

any yolanda adams song

you never mentioned what fate your church is

There is always "The Lord's Prayer" and "Jesu, Joy of Man's Desiring"