You can improve your ejaculation time by doing regular excercises. Also practicing kegel excercise can help control your ejaculation. Plus changing position and stopping when at the verge of climax also helps. You can talk to your partner about not stimulating the most sensitive parts to prolong the ejaculation. Plus if you smoke and drink loose that habit and you can see miraculous improvement in your sexual life. However lasting for one to two minutes is also very normal and you don't need to worry about anything. For more queries you can always visit a sexologist.