Frustration

So I've been able to finally play the whole song of "Love Ya" by SS501 on piano. I've learnt it off from youtube, but then the girl that played it wasn't exactly as how the song went.. so after I learnt her version I decided to tweak it to match the song more ^^ That was very very difficult but I managed to make it sound a tad closer.. now the problem is playing it fluently.. and the tempo is way TOO fast for me. I can play it fast but boy.. I stuff it up like crazy. Tried playing WITH the song, but then I play too fast -sigh-

So now, I'm just gonna play my tempo which is slower.. and when I get the chance I'll record the songs I learnt and put them up on youtube :) I still need to learn Wedding Dress xD