You asked

I don't want to breastfeed if it's going to make me tired

You should not let the idea of breastfeeding making you tired put you off giving your baby the best possible start in life. Yes, breastfeeding can make you tired, but so can everything else where your pregnancy, giving birth, and your baby is concerned.
In the beginning of your pregnancy you probably felt full of the joys of spring. As the months passed by though, the pregnancy more than likely started to take its toll. By the end of the nine months you probably could not wait for your baby to be born so that you could feel normal again. Then you gave birth. The hours that you were in labor, trying to get through the pain of the contractions, and all the pushing too, no doubt left you exhausted. Your stay in hospital helped a little - it was easy to cope with the help of the staff.
After a few days you and your baby went home and you were thrilled. However, having little sleep every night, still having to do everything you had to do for your baby during the day, and the feeding, left you really, really, tired.
The bottom line is, as with everything else to do with your baby, breastfeeding is tiring. However, as your baby grows, his or her demands become less and less, he sleeps for longer periods, allowing you to sleep more and things gradually start to settle down.

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