Eu mănânc / tu mănânci / el mănâncă / noi mâncăm / voi mâncați / ei ele mănâncă / participle = mâncat / gerund = mâncând
all one of the verbs you gave followed the same pattern, that's 100% regularity.
I mean: are most verbs conjugated the same?
most irregularities happen at 1st and 3rd person: eu beau / tu bei (same "i" as in "a mânca" / el bea / noi bem (same "m") / voi beți (same "ți") / ei beau (same as 1st pers. sg.)
There are 4 conjugations and within the conjugations certain groups of verbs are conjugated differently to those in the same conjugation. So I would say pretty irregular.
Romance languages are the group of languages which evolved from vulgar Latin. Mainly: Italian, French, Spanish, Portuguese, Romanian. (there are a bunch of others, though).
"Mancama" This word does not exist, look at the complete conjugation of the verb: