I was wondering if there any manga where there's a shota in it, but as a seme <: If there is tell me please XD Thanks you

There are some doujinshi of shounen/seinen manga with shota seme.
Those guys are usually teens and drawn young-looking by the doujin authors.
Those are what I can recall now.

You could try following mangas:

http://www.mangaupdates.com/series.html?id=876 (Chapter 2)

http://www.mangaupdates.com/series.html?id=52395 (First half of the one-shot)

http://www.mangaupdates.com/series.html?id=681

I enjoyed none of this mangas but thats only my personal opinion. Hope I could help you at least a little 🙂

Why is it that, as a culture, we are more comfortable seeing two men holding guns than holding hands? ~Ernest Gaines

Aseru fits, definitely non-con though.