Welcome to this site Huppca14, there are lots of great guys on this site. I wish I would have had a KX85 when I was 13, but instead I had this thing called a Cushman scooter, it weighed about four times what I did, only had about three horsepower on a good day and always broke down or wouldnt start. Yes it was a pile of junk but I loved it so much because it was mine.
Before you know it, you will be racing, or hillclimbing, please make sure you have motocross boots and wear them, they will protect your feet from injury almost every day. Even if you have to buy used ones off Ebay, please get boots.
Post more about your riding adventures and your progress.
John