There is attracted to someone.
Then there is finding them unattractive, as in their appearance actually displeases you.
And there is neutral, feeling absolutely nothing when you look at them.
In-between?
Would that be a developing attraction?
Perhaps it's just a mild attraction.
Being attracted to someone doesn't mean you have to absolutely swoon over them and would do anything to get into their pants.
A mild attraction can just be slightly pleased with their appearance without ever wanting to go further.
Perfectly normal...
What I have observed is, despite many males I meet saying there is no 'friendzone' and most women will quickly decide if they're attracted to you or not, despite reading many psychological studies or personal anecdotes from women saying they will decide within about 4 seconds of meeting someone if they would ever sleep with them, a lot of females I meet say they may not initially find an average male's face or body attractive, but will soon overtime fall for him once discovering his personality and traits.
I don't know man.
Attraction's a very confusing and I still believed undiscovered and unventured field of psychology, we still can't pinpoint what exactly causes homosexuality and bisexuality and such and all we have right now are various hypothesis.
Just accept how you feel, unless it actually causes you issues with your dating life as you might be unsure if you're attracted to someone enough if you would date them or not.