My advice is head over to the character forum of your choosing (like your main fighter I mean) and talk to the folks there, read guides, ask questions and read other people's questions and look at the answers given, try to take in as much info as possible. Ask others to battle you online, people who are more skilled than you, and after the matches they should give you feed back on any bad habits they noticed, things you could improve upon. Ect. Ect. Main thing is just don't give up, no matter the difference in level between yourself and others, remember they were there once too and got better from hours of practise, watching videos, reading guides, playing friends. Find a rival, someone way better than you, a goal you can strive for, become better to defeat this certain player. When you become victorious, move up. You will be hitting tournements soon enough if you stick with it. (Assuming you want to)
(Also was going to mention your thread may get locked by a moderator as it doesn't really belong in this section, would be better to ask in the general forum I believe...)