Are my writing skills good?

If you really are only ten, then you are writing quite well for your age. That said, there are errors in what you've posted. For instance, you change verb tenses, beginning in present tense, then switiching to past tense. It's quite difficult to write in present tense, so the tendency to slip into the more familiar past tense is easy enough to do. When you write dialogue, you must make a new paragraph for every case of the speaker changing. However, as you are very very young, you have much time in which to learn the craft of writing if you have a pion for it. Take writing courses in school and read voraciously in order to gain proficiency. You certainly have potential; all that is required is the time for you to mature. In the meanwhile, simply keep writing; you learn much through practice. Try to find someone to read your writings who is qualified and who will be objective. Good luck!