Dn't worry hunny you'll get better =D it just takes practice i think i've read about 3 tutorials and the rest i learned by just playing around with all the differant buttons.
Try looking on youtube for tutorials because i found it easier when it was shown to me rather than just reading it.
The key to photoshop is learning how to use the layers properly, once you've done that you'll start getting better with time. XD
As for people flamming your work, just pay no attention unless their trying to be helpful and sometimes its just a matter of taste, we can't all like the same style of art.
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< This was my very first sig xd(so embarassing)