When I ride my 18 speed bike the peddles ****, it feels like the chan came off, but when I look its still on how do i fix it

I know of NO bike that will peddle backwards.
single speed pike will brake if peddled backwards. Multispeed bikes will just rotate with nothing happening

Any time a chain comes off it means there's slack in it or something's not tight enough. Not looking at your bike, I would have to guess that you need to loosen the bolts on the back wheels and then pull the wheel assemblies back until the chain is tight. This is probably a two person job, one to unbolt and bolt and one to apply tension. That being said, many years ago I remember bikes my friends used had a problem where if they were riding at a good speed and then stopped peddling to coast, then slightly reversed peddling, then started fast peddling again, that they would throw a chain. I think what was happening was they were creating slack in the chain by coasting, slightly reversing their peddling, then starting again. The chains were also slightly gummed up, allowing slack at this time.

If this is a coaster brake bike (single speed, no hand brakes) then the problem might be inside the rear wheel hub. If that is the case then you can only fix it by completely dis-assembling the rear wheel hub - or it might be simply that the chain is slipping, which would not happen unless the chain is too loose which would be indicated by the bottom of the chain hanging down too low. However, if this is a multi-speed bike, then it could be that the chain and rear-wheel cogs are worn - which can be fixed by replacing the freewheel and the chain - however, it takes a lot of use or rust and dirt before that level of wear happens.

You need to accelerate very gently while you go round the corner. This sounds wrong but even if you hold the throttle in the same position, physics dictates that as you go round the corner you do actually accelerate as you go round a corner at a constant speed (velocity/direction/speed - look it up if your interested!).
So on the approach to any corner, you need to: -
1 Position yourself and the bike for the approaching bend, toward the right hand side of your lane for left hand bends and vice versa.
2 Adjust your speed to one you can quite happily ride around your bend (Slow down by easing off the throttle or appling the brakes)
3 Once at the right speed, (off the brakes) select the right gear for the speed your doing.
4 GENTLY apply some throttle to stop the bike slowing down anymore.
5 Tip the bike into the corner by gently pushing on the left bar for left handers or vice versa keeping the throttle still so that you hold your speed through the corner.
6 As the bend opens up (becomes a straight) gently apply more throttle as you release the pressure on the bar and stop turning.
If you want to keep improving your riding skills, sign up to a advanced riding course. They are for people who enjoy riding and want to be safer and consequently faster.
Good luck with your riding and enjoy!

There may be some chain links that do not move freely. turn the pedal slowly backwards and check for siezed links, as it goes through the deraileur.

A worn chain can do this as well, unfortunately you usually have to change the chain and sprocket cluster as a pair. If you just put a new chain on a similar problem can occur.

single speed bikes have a single ratchet or fixed sprocket with no offset of the spokes, so you would probable need another rear wheel.
Another derailleur is probably simpler, try ebay

You have the bike in a high gear. Assuming it is a deraleur type, look to see which sprocket the chain is riding on. If it is one of the smaller sprockets (on the rear wheel, not the pedals), put it onto a bigger sprocket by changing gears to one of the lower gears. As a side note, professional riders change gears many, many times during one outing. They keep the pedal speed at a comfortable speed no matter how fast or slow the bike is going. Anyhow, to review, put the bike into a low gear, particularly when starting out from a stop. If the bike makes a wierd clicking sound, or the gears don't change as they should, it is possible that your indexing in your gears needs some adjusting, or there is some other problem. Any bike shop will take care of you, as these are very easy to fix.

Turn the bike over so its sitting on the seat & bars..
There are a few small setting srews on the derailleur..
These are for adjuting.. Adjust while turning the peddles & shifting.. You should be able to smooth it out

I want to know- if there is a big difference between a 2001 v-star classic and , say a 2005 or 06 v star classic. Are the newer ones lighter, or advanced in some way, enough to make a difference?