Your reaction is not unusual. Abortion is a difficult subject. You did what was right for you at the time.
A child needs a home, support, money, security, to have a child without these things is not a kindness.
You did the right thing.
You grieve because you are a good person and you loved your baby, but had no idea how you would manage alone without income as a student. Without family support your life would have become very difficult you might have ended up resenting that child.
The grief will pass.
One day the time will be right.
Forgive yourself.

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