First dslr.deciding please?

My two choices are canon t3 or nikon d3100.Im also thinking about my future lenses.

I'd go with the nikon d3100.It feels good in my hamd too.

Both brands are fantastic - brand loyalty attests to that. Every Canon owner will tell you to buy Canon, every Nikon owner will tell you to buy Nikon. That alone tells you that they are both doing it right, being able to keep their customers happy.

Both companies are very similar, but each have a few little details that are slightly better than the other.
Really, it comes down to personal preference.

You have already narrowed it down to a couple of models, but we really can't make up your mind for you.

Think about friends and family - if you can borrow someone's lenses and/or learn from their experience, it may be worth going with their brand.

You won't go wrong with either one (says the Canon girl who loves her Canons ;-)
Whichever one you decide to buy, you will "grow into" that camera, so the camera is the least of your (purchasing) worries. Always keep in mind that buying good lenses is more important than your choice of body and be aware that you will have MANY other expenses as well, such as flash, tripod, spare battery, bag, etc etc etc.
Make sure to do a LOT of learning and research before you spend money on a DSLR - if you don't know exactly what you're doing, you'll most likely regret many of your purchasing decisions a few months later.
Then once you have it, do loads more learning so you make the most out of your lovely new gear - no point having a great camera sitting on "Auto".