I am a 14year old guy who is curious about anal what should I use?
NOTHING unless it's a dildo. You can definitely try your finger but make sure your finger is clean and your finger nail is short and filed. If you use a carrot or other vegetable in your anus, you can cause some serious harm. The wall on the inside of the anal tract is very thin and can tear if you use a carrot or anything that isn't completely smooth. You should try something that's as close to natural and your own body as possible. Your middle finger can be perfect. If you've already tried this and want to move on to something bigger, I would try a cucumber with a condom on it - if you have means to buy condoms....
As far as lube goes, aloe vera gel is pretty close to lube but can evaporate quickly, so keep it handy.
Ok thank you