Am I a healthy size?

So I'm 17 and I recently got my physical done. I am currently 5'5" and 124.4 lbs. My BMI is about 20. Is that good? I do sports (cross country, swim, and softball). Sometimes my parents will say I'm getting chubby. And sometimes they say I look aneroxic. I can't tell if they are joking or not and I've had self image issues before. They are starting to come back. I just need the opinion of someone that I don't know and is willing to be honest with me.

PLEASE DON'T ADD HATEFUL COMMENTS OR JUDGE! I was bullied for a long time about my body.