Hi, I'm A 17 Yr Old Female. Yesterday During Dinner

Hi, I'm a 17 yr old female. Yesterday during dinner while running my tongue on my gums, I felt a soft lump on my gums above my second front tooth to the left... It's small, maybe the size of a pea(if not smaller), yellowish in color and painless. There is no irritation or pain. I honestly probably wouldn't have noticed it if I didn't run my tongue along my gums. I'm afraid I have something severely wrong with me...I'm terrified of the dentist and surgery... what could it possibly be? I hope nothing serious...