And if there is, I'd love it if the senior members could assist me with it. It seems to me that utilising the bitcoin core on a mobile device won't be much easier for me, so please let me know if you know of any way to store my bitcoin without downloading the complete bitcoin core.
Bitcoin core is one of the oldest wallet used in storing Bitcoin. To run the full node takes a lot of space, and at such most persons find it undesirable to use it storing their bitcoin. Note that it does not support or have a mobile version and to download it you will need a PC with atleast 350GB free disk space.
Aside Bitcoin core, there are many Bitcoin wallets that you can use but I would advise you to go for a hardware wallets like Trezor, Coldcard, passport because it's the safest place to store bitcoin. You can also use non-custodial wallets like Electrum wallet, Sparrow wallet or Bluewallet.