Buggi LoL

I have a problem when i wait for to accept match , when i accept the game its like im 5 seconds late to the party . I can't take mid or top im forsed to play supp or what ever is left . So if u know how to fix this pls help me , im desperate... It's like i have a lack of connectiom but my internet is fast and download speed is 5 mbps and i close chome or mozila , and other stuff that is up . Please and Thank you