Welcome to Osu. What I did before I could start handling Hard difficulty speeds was play normal maps with the mod called "Hardrock"
I tried to aim for S, but got some A's and C's. I really didn't know what I was doing(since I was a nub too) but I just didn't like how slow the Normal maps were, and I still couldn't get used to Hard maps. Then After a week I started getting b's and c's on Hard songs. Then I started really trying to Full combo the hard maps, after like another week I went straight to insane, but it took me like 3 months to full combo my first insane, and boy was I happy
Also trust me on this, the better you get, and the harder the maps you play = the more fun Osu becomes, that's when the game gets really addicting, also if you really care about score rank then it'll be fun ranking up, but now there's another ranking called performance points, wich is more accurate and favors skill, but let's not go there yet, and leave that to when you get some more experience.
Hope this helps. Enjoy.
Just keep playing dude. I thought at first I would never be able to do insane maps, but trust me, they get easy over time, till you start realizing you're an insane osu player, but if you wanna be crazy you need a lot more practice and time to do the really insane maps, then you'll start asking questions about jumps, and streams etc...