This is a difficult problem to answer over the net. Many of the symptoms you list are found in HD, but none are specific and all can occur in a wide variety of disorders.
Firstly, is there a family history of HD, even though your parents don't have HD? If there is no family history then HD is unlikely. If there is a family history of HD then the condition is possible, but very rare at the age of 17.
To be absolutely sure the best thing is to see a specialist & preferably one with an interest in HD. The best thing to do here is to get your GP (family doctor) to refer you to a neurologist for a check up. Your local HD association could probably tell you who is the best HD specialist to see locally.
Thanks for your question,