@Seastrome
Without being able to actually watch your matches, I've got to echo what has been said above... mostly. Losing streaks happen; you can try changing your deck, but if it really is
not the deck and really
is just bad luck, then that won't matter. So a real question is
how much of this is in your head? Are you
really losing all the time, or are you just fixating on your losses, losses you just couldn't prevent? I've seen this happen a
lot over the years, and am guilty of it myself. I learned about it back when several friends and I were prone to whining we were losing due to coin flips.
Short version: it was mostly in our heads, and because we were playing in a setting where our coin flips were being tracked, we couldn't argue it.
If it isn't in your head, which also means it isn't just you fixating on a losing streak, then it may be you're experiencing the Pokémon TCG "for real" for the first time. Sounds harsh, but are you only now facing serious competition regularly? The PTCGO tends to do this, but so can starting out mostly playing among friends or a League that just isn't too competitive, then stepping things up. The PTCGO does this because, as best as it can, it tries to create "even" matches; the more you win, the stronger the opponent's are that it will pit you against. For me, this often means a fantastic winning streak will be followed by a serious losing streak until I get back down to where I belong. XP For the physical TCG, I learned this lesson from being a big fish in a small pond (local Leagues in the early 2000's in central Iowa) who finally had to step into a slightly bigger pond (TPCi finally instituting and improving the Championship Series tournaments).