The best thing I can say about finding someone you like is...
Be the person you seek
If you want a fit, sporty, intelliigent girlfriend (hopefully to become a wife...) then become a fit, sporty, intelligent man and you will find someone who is something like.
Lots of men want a hot girlfriend whilst not putting one iota of effort into themselves. I am quite attractive to a fair few number of beautiful women nowadays but it took me YEARS to get to this point - weight training, running, go to the gym, learning languages, educating myself - it took more than a decade to become attractive to the opposite sex.
A guy sitting on the couch scratching his arse and playing video games isn't going to attract a woman who likes to go skydiving and rock climbing - this is basic stuff, but be the person that your other half would want to have sitting beside her.
Make sure your hygiene is on point, wear a nice after shave, wear clean clothes, make sure your hairstle suits your face - there are little tweaks you can do that will make it easier for yourself.