I don't get why people want to be smart just because they saw someone outrageously smart has a hot gf.

And you are working out just to have a higher chance to get a hot gf? That's like saying girls want you for your body. See how that contradicts what you said earlier?

Do people see how sad it is to completely ignore who you really are and try to become someone who is not you, just to get a hot gf?

Be yourself(the best you could), for example, if you are lazy, find the most efficient and effortless way to be lazy while also doing the required work, find someone who likes you for who you are, else you'd never be comfortable with yourself, that's the saddest thing imo.