I'm starting to hate my dog?

I love dogs. I have been begging for a dog since I was 6 (I'm 17 now) I finally got a dog last July. He's untrainable. I've trained several people's dogs in my time so it's not me being a **** trainer. He's a springer spaniel called Ollie. I loved him at first but his lack of discipline is... show more I love dogs. I have been begging for a dog since I was 6 (I'm 17 now) I finally got a dog last July. He's untrainable. I've trained several people's dogs in my time so it's not me being a **** trainer. He's a springer spaniel called Ollie. I loved him at first but his lack of discipline is awful. I don't have the money to bring in extra help right now due to private reasons (we're not poor just other stuff going on) but I don't get why his behaviour is so bad. He's very smart and knows tons of tricks but he's hella territorial and possessive, pulls my arms out during walks no matter what techniques ive tried etc etc. He's very friendly but nothing I do ever works with him. He's just a mess and ******* crazy. As I said I used to assist in training people's dogs so I ament just bad at this but he's just absolutely wild. I really don't know what to do this wasn't what I wanted in a dog. My whole family aren't enjoying him either. He also growls and bites if you try touch him in his bed, he used to lie back for belly rubs on it and still does but sometimes he'll just bite anyway. It's so frustrating I'm stuck (sorry if this doesn't make sense I'm crying while writing this)
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