Go For It
You are thinking on a very simple level and should expand your thinking. First you need to be thinking about your position and your stating hand and what kind of player you are. if you are new player a tight aggressive style may suit you so going forward with that you will have good position and quality cards. Do you have top pair and kicker, mid pair good kick? If you open with quality cards in position, hit on the flop and the board is not representing river made straights, flushes, boats and what not you should not be afraid to call. You will not always win but a lot of the time a river shove can represent a busted draw. This is only thinking on the simplest of levels but can be a good place for you to start.