我的生日

這個星期我去倫敦。我會朋友。

這個星期我去了倫敦(Something is past, we use "了")。我拜訪了朋友(visit-拜訪)/我和朋友見面(meet-見面)

倫敦具有多沉浸和多辛酸的往事。我愛上朋有了但我覺得我們會從不。

倫敦具有很多(沉浸?I don't understand)和很多辛酸的往事。(“多”can't used to modify directly. We use "很多" instead.) 我愛上朋友了但我覺得我們不會在一起（here I don't understand what you mean, if you mean you two can not be together, then it is "不會在一起"）

我的生日今年是好和懷, 但多好。

我的生日今年有好有壞，但好的多。

你的生日有辛酸有幸福，anyway，生日快樂！

我的生日

這個星期我去You can use "去了"which means "have been to"倫敦。我會If you wanna say that i visited my friend,you can use the verb"见"朋友。倫敦具有多沉浸和多辛酸的往事"很多"is better.It'more comform to our language habits .What did you want to say when you typed"沉浸"?。我愛上朋有了但我覺得我們會從不I cannot understand what you wanna express.It's totally a wrong sentence.我的生日今年是好和懷, 但多好"有好也有坏,但大多是好的"

Happy birthday to u ~ ヽ(^。^)ノ

And i must say i totally understand your feelings about you friend.I think there is always someone that you love him or her deeply,but you two will never get together.