There are times when I have to force myself to do things. That's how it is for me at the moment.
There are times when I have to push myself to the limit. That's how it is for me now.
「無理しないといけない」＝ have to force myself to do things / have to over-exert myself / have to push myself to the limit
「時に無理しないといけない時がある。僕の場合今がそれみたい」＝ There are times when I have to force myself to do things. That's how it is for me at the moment. / There are times when I have to push myself to the limit. That's how it is for me now.
イギリス 
