Predestination is a controversial topic, but it need not be. The Bible teaches that predestination is about our glorification and sanctification; not about justification. Therefore, if we fight about predestination, we are not living according to what we were predestined for, namely, to be conformed to the image of Jesus Christ.
Do you wonder if you can lose salvation? It depends on what you mean by “salvation.” If you mean “eternal life” then no, you cannot lose your eternal life. Even still, there is great incentive to remain faithful to Jesus and obedient to His Word, for although we cannot lose eternal life, there is still much we can lose.