How do i know that he's the one?

You won't know for sure until you get to know them better - a lot better.  Walk over to the 2 brothers and introduce yourself.  Ask them where they go to school, and if they would care to join you and your parents for lunch after the church service .  This is just the first step.

The only way to know if a guy likes you is to get to know them better, see how they treat you and watch for little things that they do or say to show their affections towards you.... OR if you're brave... just ask them!!! lol

The only way to know which one you have true and real feelings for is to get to know them in a more personal way. Go out for a bite to eat, go to a movie, do things that you both like to do. Ask them questions, focus on them, men like to talk about themselves too, they dont want to always be talking about us and our business. The more you get to know about them the more you will know who you really like more then the other. I mean it is possible to like more then one person at once, but we dont always have a true, deep connection with everyone we "like". You will know who you truly like after getting to them as a person, and not just going by "face value".

If they are shy, don't you be too shy then nothing will happen!!! lol Take a risk, you never know what you are missing out on, just ask them something simple like going to grab a bite after church. Or when you get to know what they like and if you happen to like it too you can say something like... "I really love baseball" (and if they respond) then say something like "Hey, isnt their a game on tomorrow afternoon, would you want to watch it with me?" Just be casual and straightforward, this will take some of the pressure off of them to ask you out and what not. You dont have to use baseball as your example, find out what they are into and go from there....you will be surprised what can and will happen if you just take a breath and GO FOR IT!!! I wish you the best girl!!! Keep us posted!!!

The one as in marriage? like shoes you have to get out there and try some on.

Its neither.  You dont love either one of them yet.  You are attracted to the feeling of being noticed by two guys, and its a good feeling.  Being in love with the idea of love, not with the guy.  If you get to know them better, start talking, flirting, playing, together, you will know who you are attracted to, because the love game is more than just looks, there is chemistry, and common interests, likes, dislikes, personality, honesty, trust etc... all that comes into play.