I am 20 years old and still have milk teeth .last year my first canine came out and my next canine on right side seem to come out soon .

Orthodontist: See an orthodontist for an evaluation. Full mouth radiographs are needed to determine the position of your secondary teeth.

Very unusual : If what your are saying is that all of your teeth are milk (baby) teeth and you just lost 2 canines that is very unusual for a 20 year old. Normally the lower front teeth are lost first around 5-6 years old. If are saying that the canines are the last of your baby teeth to exfoliate, the question is, where are the permanent canines? You should see a dentist and have x-rays to determine this.

See an expert: Timing of exfoliation (loss) of baby teeth and eruption of underlying permanent teeth is genetically determined. The circumstances you describe indicate an extreme divergence from the normal eruption pattern (all baby teeth usually gone by age 12-14). See a dent-facial growth & development specialist, an Orthodontist, for (usually free) Initial Examination and discussion of your malocclusion & Rx.