Question

Hello There.I really like a girl which we spent time together on a college trip(I'm 30s) and realised that I  have feelings for her which has come out of nowhere and its causing me a heartache and feeling sick.She initiated contact first via WhatsApp,we went spontaneously to shops together,went swimming,she shows interest by touching,smoothing my arm sunburn.she use to text and call nearly every other day randomly to catch up.Iong story short..I asked her if she would like to meet up in 1 week to 2 weeks,she said we can plan that via text and blushed before.She texts every 5 days and now it's been a week.So last week I text her asking if she would like to meet up,she said she is busy(she works more now) and studies,but said I'm sure we can plan something in the summer time.I replied after showing interest and said let me know when you are free..she replied,yes of course! The last time we spoke was 1 week.I understand we are not in a relationship but what should i do? Should i just wait for her to text when shes free? No matter how long it takes her to get back? I'm worrying and wondering if she really Is interested. She sits next to me,use to ask me to hold her food,wanted me to come eigh her in a taxi,her friend asked if I have children,obviously plays with her hair,she randomly went swimmimg both of us in the spare moment.. asked about if her dress looks nice etc.. I'm looking pick her up to take her to a cafe then maybe a walk or something to eat then the 2nd time to dinner and if she asks,is this a date,I will say yes,this can be. In person I did say first time..as said above swimming and dinner which was my first move. Thankyou very much,I appreciate all answers and advice?

What is adolescence?