What happened to my motorcycle?

So I have a honda rebel. I was riding today when all the sudden after shifting to second, it sounded as if a gear broke and/or fell in the engine. At that point my motorcycle refused to go forward even in neutral or with me pulling the throttle in first. There's no pull whatsoever when it is in gear, and it even slightly reverses. Then itll free the tire to go about 5 feet and stop again, unless the engine is on and I pull the throttle one more. Itll reverse a little, then give me slack to push it 5 more feet. And over and over. It does this every time. I need help. Please tell me what is wrong.
Also I would like to add that there may have been a lack of oil. I was actually going to change it today and was going to pick up my socket set to do so.

You may have fried the clutch, your bike has a wet clutch and they NEED OIL.

The "slightly reverses" is a sign of transmission problems.
The fact that you heard something in the engine break just before the problem happened confirms this.
A worn out clutch will not cause the bike to go in reverse.

Bits of selector fork trapped in the gears.

You "were going to get your wrench" to change the oil.

Now you "are going to" rebuild the trans, and likely the engine, since shards of broken trans parts are now circulating through the oil.