Can u help me find my vocal range???

i dont know hoe to figure out my vocal range. i can sing pretty much all taylor swift songs good withought hurting my throat,i thiiiiiiink i can sing christina aguilera well, if i dont do the super high notes like a C6, i cant do that, well, i dont kno for sure, cuz im congested. i can sing gwen stefani too, i can hit high notes good if i dont try to go too high, too fast, when i sing the do re mi fa so la ti do, my voice gives out between la and ti, bu im kinda sick, so i dont kno how it usually is, but my throat wont hurt.