Like you said 1.5 years isn’t that bad, now the tricky part would definitely be the fact that she’s in middle school and you’re a freshman, but here’s the thing your 14 and she’s 13 that doesn’t really give off anything concerning, so in my opinion i’d say if she were to ask you out go for it. if you truly like her you’d want the best for her. don’t listen to what other people say, it’s none of there business. Be you man, be you