[Harv72b]

Bankroll requirements are meant for people who are first of all winning players (which you can't for certain say about yourself at this point; not a slam, just a statement of fact) and second of all meant for people who cannot or will not replenish their poker fund. While it's good that you learn proper bankroll management, don't feel like you must play 10NL or whatever simply for that reason. If you have more money to reload, you can start higher.

However, for most everybody it's worthwhile to start low and stay there for a good while. You need to gain confidence and experience, neither of which can come out of a book (though books help speed up the process). The poker world is littered with stories just like yours, of people who started with a few bucks, built it up, and then lost it all. In pretty much every case the player just caught a hot run of cards at first, moved up too quickly, and then caught the other side of variance.

Moving up to higher stakes probably will cut down on the number of times you get it all in with AA on a Q72r flop & then lose on the river to 97. It will also cut down on the number of times you get it all in with AA on a Q72r flop & hold against 97. It will cut down on the number of times you stack people after flopping a set against their overpair or top pair. It will cut down on the number of times you win a nice pot with AK vs. JJ after an AT3 flop. Basically, the higher you go, the fewer times your big hands are going to be paid off by worse hands, and that is where your wins come from. Stay at the low limits, and learn to accept the odd bad beat (which sometimes come in groups) as the cost of winning all those monster pots.