First of all, try to be a little more positive. If you dislike your music so much then maybe you shouldn't be a composer yet. More often than not, shown negativity tends to alienate other users. I'm not saying that you can't be pessimistic about your music because that would make me hypocritical, but try to limit it somewhat. Anyway,
I think you should have given the thunder a little more time to fade out before introducing the bell already at 0:02. Perhaps 8-10 more seconds? Also I think the pace is going forward at a velocity that is too fast.
The "xylophone sound" sounds more like a high pitched kick and there's not much melody to be heard from it. The synth that starts to fade in at 0:17 hurts my ears and is just annoying.
I like the part at 0:51-1:25 though, because it seems like you were taking the time needed to set the mood for the song. After that the song repeats it seems.
Conclusion:
- Too short, should be at least 1 minute longer, preferably even more
- Very repetitive, nothing stands out
- Tempo is too fast
- 0:51-1:25 is the best part, even though it's used earlier in the song
- Good use of audio samples
I apologise for coming off as rude, I understand that FL studio can be hard to work with since I'm new to the program myself. But I hope that I've helped in some way at least.