Is it normal i'm concerned that if i go down on a girl, i won't like it ?

Invent some kind of sock puppet with an automated tongue. When you do go down on a girl, do it in such an inconspicuous and fluent manner that she doesn't realise that the puppet is licking her poppet.
While you are down there, have some activities handy. A coloring book or play Candy Crush on silent. Maybe on silent with vibrate. Hold that thing up against her butthole. Crush those candies, biatch. You fiesty.

If you're horny enough it won't bother u. Sometimes the first whift is a little off putting but once u have your face in it and youre going at it it wont matter anymore. Just shower beforehand

Shave your cunt bald and eat the other bitches bald twat and deep rim their poop chutes until they cum , piss , fart , shit on your face , tits , belly and smear it all over your belly with their ass cheeks.
Do you like cocks at all ?
Have you ever seen a naked 7 inch boner cock and nut sack in person ?

It's normal to be nervous the first time you try something new, but you're worrying unnecessarily. If you're touching her with your hands or fingers first you'll soon know if she's not clean, ditto your own genitals if you touch them yourself and have a taste and a smell.

If you're still worried, why not have a shower or a sexy bath together first?

Trust me, you're going to love it once you try it!

Well, how will you know if you don't give it a try? I have given a go at an oral go at a guy's package, and I honestly enjoyed it, being unsure myself when I started out. Honestly I am still questionING myself sexually, however that gave me some perspective that I will never regret any of my actions...

Take a chance you dumb cunt. We all do and if you are both clean it will be alright. Trust me you bitch.

Become comfortable with your body. Look at your vagina in the mirror and all that. Understand that not every vagina looks the same, and that's okay as long as it's clean (no yeast infections, etc).

If you're uncomfortable with the idea still, you can always use dental dams (they come in different flavors too lol), or simply play with toys together (strap-ons, double head dildos, etc).

jsut tell them you dont wanna go down on a tuna fish. its normal to be nervous for your first time no worries.