Language fail fest.
Alpha please don't rage at people. Its a very good way to make sure that people don't like you. Also I am not sure what you mean about the helping new comers but I would wager that I have played this game less than you. I posted 3 years on my application because I played LAN with friends but within the last month we have moved to online play. And granted I had some help from decent people (Panda a.k.a. NazLog, Subliminal, and Knightmere) who are all in different clans now, but I had to figure a lot out on my own. My suggestion for getting better is to watch what good people do and try to copy them. I did that and I got better, I think you can do it too.
Practice hard

P.S. to improve humans I recommend all rifle 100% of the time. Its good for aim and forces you to dodge or you will get butt
****. I did it several times and my humans are so much better (right pedro?)
P.P.S to improve aliens start with all dretch. You need a good dretch in order to do anything. If you can kill armoured humans with a dretch then you will not be utterly destroyed if you get stuck against s2 humans. After your dretch gets good work your goon (or mara... they are just harder to get the hang of).
P.P.P.S. I don't claim to be an expert on this game (infact I am far from it) this is just what I did and I imagine it will work for you.