Be/get used to+gerund vs. used to+infinitive

I used/am used to enter competitions.It was tough at first but I'm used/I used to it now.
I spent about six months gettinf used to go/going everywhere in a wheelchair and then the doctor told me I was ready for an artificial leg. He fifted it a year ago and,at first,I found it really hard to use but I completely used/I'm completely used to walking on it now.
I used tl have/having a really active life.Apart from the surfing I am used/used to go mountain biking and hiking.Of course,I'm not as quick as I used to being/be but I can still have fun.I haven't got used to go/going back into the sea yet.

I used to enter competitions. It was tough at first but I'm used to it now.

I spent about six months getting used to going everywhere in a wheelchair and then the doctor told me I was ready for an artificial leg. He fitted it a year ago and, at first, I found it really hard to use but I'm completely used to walking on it now.

I used to have a really active life. Apart from the surfing I used to go mountain biking and hiking. Of course, I'm not as quick as I used to be but I can still have fun. I haven't got used to going back into the sea yet.