Daniela: First of all, darling, you need Jesus. Kidding aside, be mindful of your actions before doing anything. Consider the feelings of the guy. Don't just pounce on him. Consent is important. Make sure you're aware of the possible consequences. As blockmates, you're gonna be stuck with each other for a year or two and things would turn out awkward if ever things wouldn't work out between the two of you. Maybe this feeling is just passing, which is pretty normal since you're growing up and in college, you're exposed to these kinds of things.
Reign: Maybe tone down the "thirst" just a little bit. Sometimes it's normal to feel sexually frustrated towards someone, but those feelings will eventually subside. It's tricky to know whether or not your blockmate feels the same way or at least is open to the idea, so I suggest you don't make any sexual advances just yet. Try to get closer to him/her instead.
Daniela: If you're okay with choosing a seat which is farther and cheaper, you could still buy a gift for your mom. Or, you could take your mom to the concert and you two could bond there.
Reign: I agree with Daniela. I also had this problem a while back when Paramore went here for the first time and its was my parents' anniversary. Long story short, they were with me during the concert and they enjoyed it. I think your gift for you mom doesn't have to be that expensive. I actually think it's better to give something handcrafted or at least very sentimental rather than buying her a bag or something. Try to think outside the box.