[AlexB182]

Your play on flop and turn is absolutely +EV, it's exactly how you have to play against calling stations. Would've been perfect if you would've folded to his river shove.
PTBB winrates are often a big issue here and it is very problematic to say how your winrate will be if you have not played a certain (BIG!) number of hands so far.
7k hands at NL2 are far too few to draw any real conlusions fromt and 40 PTBB is definetly not sustainable over the long term. Unfortunately, I have never really played NL5 myself but from what I've read here I think that between 4 and 6PTBB should be possible there. Maybe someone can confirm or deny this.
Let me add one thing: personally I am of the opinion that especially when you just start out playing poker online, winrates should not be of such a big importance to you. If you improve your game steadily and play much more hands than you have so far, your winrate will develop and, more important, you will be able to obtain a healty winrate.