Sad to hear stories like this, but do not give up on Crypto completely as I believe in 5 years time even this loss will pale in comparison to the possible gains you could miss out on by leaving.
First you need to educate yourself on basic security practices however. If you can, get a hardware wallet as many here have already recommended and get away from online wallets except for very small amounts you intent to use within a relatively short period of time. Practice with your hardware wallet and become very familiar with how it works and how to properly recover the funds. Test with only a small amount <0.001 BTC until you are comfortable with how to get at your funds in any situation.
Also, as others have pointed out, do not post any more information publicly about yourself, including emails, accounts, wallet addresses, or other information than is absolutely necessary, and in most cases this is zero. Hopefully you wouldn't post your Bank's name, account number, and amount on deposit on the Internet, and neither should you post any details about your crypto holdings.
Any online accounts you do have, you should use dedicated email addresses only for that account and never post it anywhere. Use only services (email and other) that provide two-factor authentication, never rely on just an email and password for security.
Sorry for you loss. It is never safe to store significant amount on your computer especially when you're using windows. If you'd ask me an android phone is much safer than PC but it is far more safer when you store it on a hardware wallet. Hope you learned the lesson.
While Windows may be less secure, it is only due to users not taking the time to practice proper security precautions. There are many guides online how to lock down a Windows installation to be in fact quite secure. The main problem is people are using their all-in-one PC for everything and not exercising the caution they should be with so much money at stake. Just like you wouldn't (hopefully) leave an envelope with $20,000 cash in it laying around in your unlocked car, you shouldn't leave the same on your non-secured PC.
For any amounts over $10k (arbitrary) you should be looking at a hardware wallet or dedicated PC. Regardless of OS, take time to properly secure it and disable everything not needed to simply run the wallet software. Be sure to encrypt your wallet with a hard password of at least 32 mixed characters (Upper, Lower, Numbers, Symbols). Setup firewall rules to only allow the bare functionality needed. Never use it for anything else, never ever use a web browser or email client on it, just the wallet and that's it. The only time it should even be running is when you are syncing and ready to make a transaction.
Also don't use wireless and have a decent home router with everything locked down. Again, many sites on how to do this and test its effectiveness are out there.
Anyway, I could go on forever, but the end result is your funds are only as secure as the effort you put into securing them. In this case it sounded like the OP put too much trust into third parties and did not take time to understand how any of it really worked, much less how he could himself take more proactive steps t securing his funds. Now he is pissed at the world because of his carelessness and is ready to give up rather than double down and take advantage of the opportunity of a lifetime.