Rowan Tree

I have a 3 years old Rowan Tree. It has grown to about 8ft. But there are quite a few thin branches crossing over each other it all looks a bit all over the place. Should I cut the thin branches off also would it be ok to cut a foot or two off the top of the tree.
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In the sticks near Peterborough
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.