Maybe because, as you said, you love God. It's no big deal praying just might get you emotional in a good way. I cry every once in a great while when I pray and that's because I feel like I'm letting burdens go when I talk to Him.
Maybe you are praying from your heart. There is nothing to be ashamed of. I am proud of you being a christian and going to church. There is nothing wrong with crying in church. It is more common than you realize. Keep up the good work!
there is nothing wrong with letting out your emotions to god. he doesnt judge. niether should we. ive seen a lot of tough guys cry before, and it broke my heart. they were all great friends. it's a weakness that we have for god. we love him so much that we can let go of our issues and empty out to him.
Crying during prayer may occur naturally or supernaturally. I do cry sometimes but I realise that I cry at times when I am under intense pressure and memories come back while praying or i may simply be "touched"......the conclusion remains neither of them is bad.