ign=ddevans96, recently picked it up again after a few months.
I tried to get into warframe, but the limited inventory made me want to die
You mean having to buy inventory slots with platinum? Yeah, that's one of the less appealing things about the game, for sure. It is possible to play with no money spent on platinum by having a plan to get trade fodder and executing it (Zephyr's done this to great success, for example), but I can understand that not exactly being ideal either.
That being said, it's one of my favorite games and I recommend it regardless, especially if you have people to play with. If you consider it again, take the trade-heavy route and don't be afraid to ask around for guidance.