How do I reject guys?

I don't know why I get ask out a lot or get confessions when I'm a quiet person. Yet I had guys ask me out but I don't know how to reject them still. I'm not big on confrontation and I try to reject them nicely but some don't get the hint or maybe I did not did my part that they continue on.
So how do I reject guys that are:
⏺Older than me (like almost 10 years older than me... Because I feel like since they are that old I need to keep some kind of respect)
⏺Guys that say they like me for a certain characteristic
⏺Guys that are waaaay too nice
⏺ Guys that are too loud and they intimidate me for being pushy and are rude
⏺Guys over text (like they somehow got my number and we only talk through texting)
⏺Guys that are in the same class or friends that like me, without destroying their friendship (yet they themselves don't know they like the same girl at the same time)
How do I reject guys?
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