TTC at a young age

My fiancé and I have been together for 2 years and were 19 and 20 and I know we're young but we have an apartment and full time jobs and we have extra money at the end of the month, is it bad that we want to have a baby this young? We would be able to support the child and we even make enough I could drop back as just part time. Or take the first 6 months off to raise the baby in the really important times. I just want to know if we're crazy. We plan to marry next year in the spring.