what's wrong with me

i'm 16. my family isn't the best but i get over it, i just don't really care... i have a boyfriend who loves me more than anything and i love him so much, he's the one who helps me with everything. sometimes i just start crying or get sad out of nowhere, and i don't know why. could it be depression? i have self - harmed before but only a couple times to let out a bit of anger. i want to go to see if i have depression, what do you guys think?