losing my virginity. HELP

im 18, my boyfriend is 19, and we have been together for around two years. we’ve never had vaginal sex, but have recently decided we are ready.

this is 100% confidential. our parents are so against pre-marital sex so i can’t talk to my mom about it. i’m also not on any birth control and can’t afford it without the help from my parents.

ANYWAY... any advice or things i should know ahead of time? what to expect? brands of good condoms? or should we not even go there without birth control?? HELP