Well, first of all, if you;re talking about evolution as is understood by most "lay people", that the universe started by a big bang, that the earth was a cesspool of primordial slime, and through billions of years, evolved into what it is now, then the answer is that such fables do not fit in anywhere with the Bible.
As for dinosaurs, it's obvious, they existed, and were extinct. So were other animals later, like the mammoth, the dodo bird, the passenger pigeon, and many other animals that we know now are on the verge of being extinct. How dinosaurs became extinct, the Bible simply does not say.
Why doesn't the Bible mention dinosaurs? Let me answer with this question: Why doesn't it mention cats, flamingoes, parrots, alligators, turkeys, chickens, etc.?? Does this mean that it denies the existence of these animals? Of course not! The Bible is a book about salvation, not science!! People who ask such questions are not honestly desiring to be saved, They want to disprove the validity of the Bible so that they can continue in their sin. they want to get off on tangents because they do not want to face the heart of the matter, that the Bible is about man, not animals. It's about man's lost, hopeless condition, in danger of eternal death unless someone saves him. Very few people are wanting to humble their hearts and adnit such a truth. So evolution cures their fears, puffs them up, and encourages them to continue sinning, because with evolution, there is no God, therefore, there is no law, no judgment, no right or wrong. Therefore, they can do all their heart desires, andwe know that the Bible says that the heart of man is deceitful above all things, and desperately wicked.
Don't let these people's stubborn, wicked hearts scare you. This is an opportunity to strengthen your faith in the true Word of God, and to establish the strong foundation that will hold you through storms such as these.
Keep the faith, and don't give up!