Can a 19 year old get separation anxiety?

I’m 19 and been with my boyfriend for 5 years now and i’m being honest when i say that whenever i’m not with him (which is every day during the week) i get really sad and depressed and just don’t want to do anything except go see him. I have no motivation anymore to do anything, i considered quitting my job. i won’t of course but i’ve just been feeling off because it’s like i need to be around him at all times, cause then i feel safe and at peace. Ive always missed him and stuff but it’s getting somewhat serious now and taking a toll on me. am i crazy or this normal 🤔

Let me also add that a lot of the time, i don’t want to be around anyone but him. meaning that if we’re in a group of friends or family together, i want to ditch them or leave early because i genuinely just want him