a girl i like

Theres this girl I like in my culinary class, she is like super cute and like shes the definition of cute and pretty. Shes a senior and im a sophomore rn but if i cant be her lover I at least want to friends with her. Shes already friends with my older sister so I at least have that. And again shes a senior so shes graduating in like 2 weeks so I dont have much time.

 Shes also super funny every time we talk im always laughing or smiling but tbh if I were her I would think of myself as weird so lately ive been trying not to laughing but now it just makes me look weirdly rude. Shes asked for my Instagram for a class project but I said I forgot it and she said she'll ask my sister for it later, my sister is almost never at school recently so she never got it so ive been thinking I should get hers from my sister.

 Im also not really that talkative so that also makes me look weird + im ugly too so theres no way she'll like me so again I just wanna be friends with her at least. Any advice on how to act with her and how to get her to not think im weird??