Confused...:( please help!

Theres not really a way to not make them feel bad or mad. You just have to be honest. I usually tell ppl... 'Im sorry but I just don't feel the same way about you, maybe someday I will, but for now I only see you as a friend.'

Its really nice to see you care about someone elses feelings.
Finding honesty is something unique in people today.
If the person has deep feelings for you then set down and tell them that you are sorry but you just cannot find feelings for them to pursue the relationship that they want.
If they really do like you then they will accept what you say and not 'blow up'.
They should respect your decision..
If they get mad this is ok, if they cry then that is fine.
This will most likely happen..
But if they make a big fuss about it then it is quite out of line.
Relationships can never be a one way thing, else you will never experience life as it should be.

If it is someone who is not close to you yet..
This is much simpler, jus straight up tell him you are not interested in a relationship with them..
Tell them it isnt anything personal..
If you are looking some specific qualities and cannot find it within them.
Then you can easily use that to explain to them that you cannot find the qualities in them that you need.

Their are many ways to do this, since you seem like a nice person as you are taking into consideration their feelings.
I know you most likely not take the wrong route.