You're an Adventurer.
Adventurer (冒険者, Bōken-sha) is a term that is associated with individuals who undertake official quests offered by the Adventurer's Guild.
Adventurers are individuals registered under the Adventurer's Guild, regardless of race or ethnicity, whom undertake quests offered from the Adventurer's Guild and complete them in exchange for a monetary reward.
The nature and fatality of these requests can vary, from monster subjugation, escort, investigation, etc. To ensure that the adventurers are fairly compensated, there is a bare minimum sum that has to offered, by the poster of the said quest, as stipulated in the Association's rules and regulations.
It is not compulsory for an adventurer to form a party, as certain adventurers are well known to be able fend for themselves and manage alone. However, the likelihood of survival and success in carrying out quests would increase should they form a party.