Thanks! How can I transfer them elsewhere?

Hi everyone! I am very new to Bitcoins and I am panicking right now so I would really appreciate some help.

- Bought bitcoins on localbitcoins
- Successfully deposited onto my walled on there
- Went on Bitcoin Core... File > Receiving Address > New... and created an address
- Sent from localbitcoin wallet to this address.

I immediately panicked when I saw my balance on Bitcoin Core was still 0! However, I checked on localbitcoins FAQ and it advised me that I have to wait for at least 6 'confirmations'. I have recently checked it is now 7 'confirmations'

Bitcoin Core also says 'Synchronizing with Network' 3 years and 29 weeks behind!? WTF? do I really have to wait until this is synchronized? Some people on other forums say it can take days.

Is there anyway I can reverse this transaction so my BTC are immediately back on local bitcoins? Or do I have to wait?

Thanks so much and sorry for the noob post!