hi kaylia!
i think you wrong with that what you said about people who are more talented than you, that doesn't have to be true. (ok i't can be, but...)
most of the people who are succesful as good pianists have in background a lot of hours spent in practising and polishing pieces they play. you said you're lazy. that isn't good, you have to discipline yourself. i know how hard it can be, because i have had that situation, and sometimes i still have it! sometimes is really really really really really hard to practise, especially when you have to get up early (for example in winter, when is still dark outside and cold, and you have to get up to start practise!

) but then i said to myself-i love it, if i do practise now, my playing will improve and i'll be happier.
you said you have slow progress. how do you practise? does that include your brain, or you just sitting like a bunch of potatoes and moving your hands?
i experienced that practising just 30min. but PROPERLY can have more effects than 2 hours spent in bad practising.
and also, which is very important, you have to practise every day. i'm saying this from my mistakes what i didn't practised disciplined-and my results were...quite bad i think. (my tehnique...ugh...)
you also said that some people who have played piano for 5 years can play hard chopin works, but you didn't mentioned-HOW? maybe they can tehnically do it, but in musical way i don't think they will understand structure they play. (except they are geeeniiuses

)
you can play chopin piano concerto, but if you don't play it properly, it is sounds silly.
think like this-'every piece i have, i will do it on my best, it doesn't matter if is that piece isn't hard as chopin sonata or stuffs...
i hope this will help. i had problem like you, but i think this forum helped me so much
good luck with practising
ana m.