I am a 17-year-old boy and I was wondering if I can use the same condom twice?

No, you can’t.
If you put a condom on the penis for a second time, sperm can accidentally get on the outside of the condom.
Then the sperm can enter the woman’s vagina.
Then the woman can become pregnant.

We have a few tips for you:
Only use condoms from sealed packaging.
Do not use a condom if…
The packaging is broken or open.
The condom is torn.
The expiry date has passed.
You have ejaculated.
You have to pull the condom down the penis again.
The condom does not fit the penis properly.
Then you must throw the condom away.

You can buy several condoms at the same time.
Cheap condoms are sold in drugstores.
Buying condoms is completely normal.
You are showing that you are taking responsibility.
You do not need to feel embarrassed!