I sometimes wish my life was like an early-2000s teen movie
Why that specifically? Does your life really suck?
In a sense. Although I have a girlfriend, nice house and a good job at a top tech company, sometimes I feel lonely still
I'm sorry your life isn't as good as you want, and sometimes it's healthy to fantasize like that. It's a great pick me up to imagine things differently, but as long as you don't overdo things. You don't want to become maladaptive and neglect all your duties for your fantasy.
I just don't know how to make things right then.
Since you like fantasizing about things that could happen can be beneficial to your situation! You may have the chance to bring all of this to life if you try, to better your relationships and your life.