I actually think that operating as a solo poly might work for you - if you can be honest with yourself and your partners you can "be in a relationship" (or relationships) and still "go clubbing, get drunk, and hit on girls."
You might want to read some of NYCindie (a member on this site) has to say about enjoying dating as a way to meet new and interesting people and have positive experiences without, necessarily, viewing it as an "audition" for a "potential partner."
I don't know that I would use the word "polyamory" from the outset - just let people know that you are interested in seeing them/sleeping with them but that you aren't interested in being "exclusive" and letting each relationship develop (or not) at its own pace. I do think that you might want to be VERY up-front about this to avoid the "hurt" that you have seen previously. I would advise being scrupulous about your sexual health (condoms always and frequent STI testing).
I look back fondly on my years of non-attachment - casual sex and "Friends-With-Benefits". I learned a lot about myself. When I fell into a relationship with MrS I "knew" that it was somehow very different - even though it started out the same way. I still like to "get drunk and hit on girls" though - luckily both of my boys are fine with this!
Me: poly bi female, in an "open-but-not-looking" Vee-plus with -
MrS: hetero, probably mono male, my live-in husband (together for 21 years, married for 17)
Dude: hetero, probably poly male, my live-in boyfriend (of 2 years; friends for longer) and MrS's best friend (for several years longer than that)
VV and MsJ: bisexual women with male primaries, LDR FWBs (of 19 and 7 years)
My poly blogs on this site:
The Journey of JaneQSmythe
The Notebook of JaneQSmythe