Janna i would do the same thing with an adult, but it sounds to me like this is a colt - i would never round pen a horse under 2 1/2 myself, but some will do it a little younger. I also don't like roundpenning a brand new wild horse- they are already terrified, let them learn we aren't going to eat them first.
Miskriss it sounds to me like his area is too big for what you currently need. He needs to be somewhere small and distraction free. Sit with him and let him come to you, don't immediately reach up to him the moment he comes over. This is pressure to him and he's going to move away from it, this would tell him not to come over to you because each time yougo to touch him. Let him get completely comfortable in your prescense, let him brush up against you as he walks by, don't just reach out and touch him.
At the point you're at i'd be considering adding some more motivational positive reinforcement.
Is he in with other horses or are there some within reach when you're there? If they are this will slow the process. Horses a herd animals but they will look to herd with horses before humans. At this point you want you to be his only option in herd members. This will make you more valuable to him.
With our wild ponies their first touch we would just rest our hand on their whither and stay with them in their stall- they will back up, move forward and sideways, just keep things quiet and calm but keep with them. Once they stop moving take your hand off. Repeat this for only short 5 minute sessions at a time so as not to work them up. You can use a crop or fake hand or something if you need greater distance between you and the colt.
But i really think close 1on1 contact and lots of time is your best ally.
The method i just mentioned is what we used to do, ut always worked but it was slow. A new way we've been doing it lately, that the little girl used with the pony i mentioned earlier was with positive reinforcement. Start with the food next to you, let him work up the courage to come over and get it in his own time. Once he no longer hesitates about eating beside you (with you not touching him) you can move on. Stand with his empty bowl beside you. When he comes close click (i use a smooch noise) and put a little food in the bowl. Do this until he is readily comjng over to you anywhere in the paddock. If you can safely hand feed him this is better so he isn't following the bowl. Work on this until he is comprehending to follow you and that your click noise=food. Once he's readily following you now just reach out your hand, closed fist, slowly, give him time to try, if he gets close at first with just a whisker touch, click+treat. Gradually build up to be able to touch his muzzle and face and all over eventually. This is how the 13 year old girl can now lean over and give her pony a big barrel hug and the pony following her all around. They're working on unmounted agility now because the pony is too small to ride. She also used this to get her used to the farrier. If at any point he makes a turn around and actually becomes pushy for food, invading your space or rudely nudging you or pawing then you ought to nip that in the bud. This is where we start most not-wild horses. I stand in front of the pushy/invasive horse with the food giving a short growl or whack if they get too pushy (judging by your colt i don't think you'll need this) once thy turn their head away for any reason i click+treat. This teaches them the only way to get food is to stand patiently facing away. But right now you want him near you and you can build that up before asserting respectfullness. You can also help prevent pushiness by always feeding behind their chin so they have to back up a bit to get it.
Good luck keep us posted!
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