Yes I am over weight but I have lost some since September. I like playing football each Saturday but other than that I'm pretty lazy. I just have no motivation and it kinda sucks. I want to play Tennis with people but I can't find any one to play with
But I lack confidence as well.
It seems to me that you're main problem is indeed the lack of motivation and confidence! You need to want to do it and believe you can. Because you can!
As for sports, try to get used to jogging. Go jogging 3 or 4 times a week, but really do it. Because the first few weeks you won't like it, but then you get used to it and you start loving it and NEEDING it!
I'm in, depending on the day. And now that I am in Coimbra, it has to be always after 8pm my time.