Didn't wear retainer for 2 years.. now putting it back in hurts, help!?

Hi, I had braces for 5 years. As I got them off i swore to wear my retainer. I always wanted the pretty coloured braces, but my orthodontist refused to give them to me. So I asked for a coloured retainer with glitter & all things pretty. I didn't get it, my purple retainer request was a purple retainer case -.-

I was so happy with the result of my teeth that I forgot about it & wore the retainer every day & night. It was a fitted one, so it was virtually invisible. I was good until i had to brush my teeth & retainer after i ate. Every time i ate. It was embarassing at school, i hated the idea of brushing my teeth, nobody else did it! So i just put my retainer back in after i ate. Then I saw that food was getting in it, so I washed it with water, which did not work.

I decided i wanted the wire one with glitter & colour. To get this I had to not wear my retainer at all. I did this thing where i had it on when i was due ffor a check up. Until eventually i got a new one.

My old one didn't make me lisp at all. But the new one did. I put up with it for a while, I liked showing off the rainbow glittery bit. I don't know why now. Anywayy... lisp got too much for me. I wore it a few times, then forgot about it. i eventually just didn't wear it at all. i got it about 2 years ago. So its been a few times a year over these 2 years. Now putting it back in is incredibly painful, i suck icecubes to numb my mouth. It fits, but I have to adjust it a fair bit. Will my teeth get straight again if i wear it all the time? Thanks xx