Either use paper wallet or HW wallet. 

if you don't like using a software (download anything) and trusting computers, then go completely offline and do everything physical instead!

a private key is a number and a number can be generated without a computer and with physical randomness. for example you can use a physical dice to generate that number. there are 16-sided dices which you can buy and make a hexadecimal number with them or you can use normal 6 sided ones but it will be more complicated.
read these:
https://www.swansontec.com/bitcoin-dice.html
https://bt.irlbtc.com/view/297077.0

I believe you have it the other way around. Paper wallets and hardware wallets WILL give you that safer feeling when compared to storing them in a desktop wallet. Especially in a computer that is online everyday and has a cracked copy of Windows installed. Much worse if you share the computer with other people.

- Electrum is considerably secure than other web wallets, it is true that jaxx doesn't encrypt private key stored in your device so if your device is infected you might get hacked.

- Hardware wallet like trezor and ledger wallet is most secure wallet.

- Cheap solution for you is to print out paper wallet from bitaddress.org github file with offline computer and offline printer.

YOU can try Trezor 

Hey dude, I can just actually send you a private message but I prefer to transact with you publicly. I am selling hardware wallets, these are multi-coin hardware which you can use to store your bitcoins for long term. I sell it for $134 but you must pay for the shipping. I assume you are from the Philippines, aren't you?

If your budget was a little tight, I can sell my pre-loved hardware wallet but it only supports bitcoins and bitcoin cash. You may upgrade it via Windows 7 to support 2x coin in the future. Asking price is $76 for it. If you live near my spot, I can actually hand it over to you personally. Don't worry about the security because as soon as I hand you over the actual hardware, I would not have access to it at all.

Again, I transacted with you publicly so that you know that I am legit. Cheers!

There is no need to buy an expensive hardware wallet like Trezor. You can download and use Bitkey, https://bitkey.io/.

It is a Linux distribution that you can boot using a USB or a CD/DVD. It has all the Bitcoin storage choices you need at a fraction of the cost.

I am willing to forfeit convenience for superior security. I believe Bitkey can be better and more secure than a Trezor if used correctly.

If you are just starting in Bitcoin, learning all the secure wallet solutions is a must.

You should use Paper Wallet or Hardware Wallet. Also, you can use https://bitkey.io/

And I appreciate as you wish to hold on to your BTC, good luck

Paper wallet is a safe way to go. Generate it, print a couple of copies (to store in different places) and never use your private key until you want to cash out. That should be pretty safe.