I'm 17 with one year no motorbike claims bonus in the UK?

When i was 16 i insured a moped and rode that for a year without claiming on my insurance which was £300. NOW when i've turned 17 i'm hoping to ge a nice honda bike which i went through a quote saying it was £900 (which it is) and then the insurance came back with a £662third party fire and theft. Which i knew was expected as i have to park my bike infront of my house. BUT then in the small print all of the insurers say that i would have to pay a compulsary £800 if i made a claim! Wtf right. Also add the £662 onto that, i could almost buy another bike with that amount of money which would mean making a claim is just pointless. SOMEONE Please Help ON WHAT I SHOULD DO

1) you must have valid insurance.
2) As this policy is Third Party Fire & Theft it's nothing to do with damage or loss to your bike it's all about the damage you can do to others. Injury claims can run into millions but you'd only have ot pay the first £800
3) If you consider your excess to be worth more than your bike then drop the fire and theft part and just take third party only (No one is going to steal a burning bike)
4) With third party F&T even if you are involved in an accident where the other side is 100% at fault your insurance company will not lioft a finger to help you unless you have legal cover.
5) You can reduce the excess but that will increase your premium.

I'm only worried about it being stolen to be honest, please respond.

It's not the value of the bike that determines insurance. It's the damage you can do if you hit someone. Property damage and injury/compensation. Shop around though but be realistic.