I'm hopeless because all my life I had amazing girls into me and I'm now 25 and single
Why do you feel so bad about where you're at now?
It's not unusual to reminiscence about the past. Maybe it can inspire you to work on yourself and find someone?
There's nothing wrong about engaging in a little nostalgia here and there.  Let it drive you to create equally fulfilling memories in the future!
I'm horny.
If you're lonely then you should work on being a better protentional partner instead of being upset. Women like guys who are confident, not self loathing. You'll have better luck acting and feeling confident about yourself.