Sexually attracted to mares. Feel like a freak. Just a normal 20 year old dude.

Yes, you're probably normal. Being a zoophile doesn't mean you're suddenly not normal or a 'freak'. At worst, it's just a quirk. Society at large would disagree with me, of course, but this possible element of your sexual orientation is still just that, and doesn't reflect anything else about you.

Haven't told anyone, probably never will.

A wise move.

If you find these attractions growing and/or find yourself lacking or losing interest in humans, you may want to find an outlet for those attractions(as I assume you don't wish to pursue them). The best way to avoid biting into forbidden fruit is finding something just as sweet to eat, after all... unsavory as that may seem to you. Doing nothing but suppressing it in the case of exclusive zoosexuality will only wear down your willpower over time. Of course, you'd want to review whether said outlets are legal in your jurisdiction. Either way, it's better to approach it on your own terms than it is to approach it because you were no longer able to remain rational about it(Note that I say this as a fact of sexuality in general, and not just zoosexuality).

Some of the less discretious people who frequent here may suggest the possibility of it being nothing more than a sexual fantasy or a fetish, which is something to consider, but not assume.

If I may ask, how did you discover this attraction?

Having a particular sexual orientation or paraphilia is not a problem as long as you use some common sense about it. Nobody is perfect here, you can be sure that everybody has biological or psychological dysfunctions they don't talk about. Liking mares is not one of the worst.

It is important to note that acts define you as a person more than your fantasies or thoughts. This is because your acts are what passes the filters your psychology imposes on your deepest feelings and thoughts. As an extreme example; it is ok to have fantasies about killing your in-laws as long as you don't do it.

Not to put a lot of pressure on you, but the only person that can cope with your sexual identity issues is yourself. It is important that you explain why you feel bad about liking mares so you realize what is making you upset about the matter.

When I discovered that I was a equine-centric zoophile, I didn't feel well about it, but fact is that I am still here many years after. I am a common person with common worries and common issues and zoophilia has not destroyed my life or damaged me in any way. Life is not about being perfect, it is about learning to live without your peculiarities.

Can´t someone add a "if you expect genuine and elaborate feedback, provide an accurate picture of your situation, motives and interests" rule to the sidebar?

It´s kinda exhausting when you have to ask over and over again for more details; based on the little info you gave us, you could basically be anything between a horny pervo and a genuine zoophile. How do you expect us to provide reliable adivce when all you do is throwing us some breadcrumbs?

Please share some more info. How did you discover your special attraction? Are you familiar with horses? Do you consume animal porn that resulted in your newly acquired "special interest"? How dominant is your attraction? Still into humans? What are your expectations? Do you actually want real experience with a mare? These are just some of the questions you´ve left open. Without sharing a more in depth view of your situation, any advice will be rather useless.

You're not a freak

continue to live your life brother, Just because your attracted to a horse doesn't mean To need to screw a horse.

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You are a freak, most people are freaks (they keep their skeletons in the closet) nothing wrong with being this kind of freak.

Nobody is normal either. Again, nothing wrong with being abnormal.