Yes, but it's complicated. There are several classes of verb with different endings, and conjugation can depend not just on person and number, but gender.
"Lubić" is a second-conjugation verb, so in the present tense its conjugation is "lubię, lubisz, lubi" in the singular and "lubimy, lubicie, lubią" in the plural. (Luckily, gender doesn't matter here in the present tense)
Bryan, at http://www.tastingpoland.com/language/verb/verb_infinitives.html you can find a lot of verbs with their conjugations.
It's like that - In Polish I am = Ja jestem , and jestem is always I, so you can skip it, it's unnecessary. In polish not only "be" changes depending on person I/thou/he,she,it/we/ you all/ they(men),they(not men) but all verbs
"you child like milk" is different from "child likes milk".
in polish you children like milk= (wy) dzieci lubicie mleko.
children like milk = dzieci lubią mleko
we skip pronouns because
lubię can only mean I like
lubisz You/Thou like
lubimy We like
lubicie You (plural) like