How do i make sure my Bitcoin Private Key is Random and secure?
So this thing keeps giving me stress and i need answer 
So i know bitcoin private key is secure and there are 2^256 private keys and i also understand that it's impossible for 2 people to generate the same btc private key.
BUT what i think is possible is a bitcoin wallet generating a bitcoin address whose private key is in the range of 1 to say 10000?? then it's vulnerable to attack right?
See basically a private key is an integer between 1 and 2^256 converted to hex right. So what's stopping Random number generator to pick a private key from say first few million integers??
Isn't this a vulnerability?
Of course, advanced user can simply convert their private key to hex and to decimal to check if it's a large enough integer but what about noobies?
Here - https://privatekeys.pw/keys/bitcoin/1
You can see on the above link. Any attacker can easily brute force first few million private keys so how to prevent such attack?
So i know bitcoin private key is secure and there are 2^256 private keys and i also understand that it's impossible for 2 people to generate the same btc private key.
BUT what i think is possible is a bitcoin wallet generating a bitcoin address whose private key is in the range of 1 to say 10000?? then it's vulnerable to attack right?
See basically a private key is an integer between 1 and 2^256 converted to hex right. So what's stopping Random number generator to pick a private key from say first few million integers??
Isn't this a vulnerability?
Of course, advanced user can simply convert their private key to hex and to decimal to check if it's a large enough integer but what about noobies?
Here - https://privatekeys.pw/keys/bitcoin/1
You can see on the above link. Any attacker can easily brute force first few million private keys so how to prevent such attack?